QNAPTS-435XeU-4G-US 4 Bay High-Speed Short Depth Rackmount NAS with M.2 NVMe SSD, Quad Core Marvell Octeon CPU, 4GB DDR4 Memory, Dual 2.5GbE (2.5G/1G/100M) and 10GbE Network Connectivity (Diskless)

So let me preface this with I have a fairly robust network infrastructure.I started with spinning disks in mine and eventually switched over to 4tb WD Red SSD's.I have this connected to my network using both 10GbE SFP ports and both 2.5GbE ports, each for availability to different VLAN's. The transfer speeds are amazing, I'm averaging over 900Mbps with this unit.While yes the Menu system can be a little frustrating, once you get used to it, it works! With SSD drives it runs much cooler. I did upgrade the memory to 16Gb and added two NVME drives, one for caching and the other runs an NFS share to my Proxmox Servers and provides high availability for some VM's I run.All in all this is a strong unit, build quality is excellent.The noise albeit can be higher as you crank up the fans. Typical for a 1u piece of gear, those little fans have to work harder. So if you are not putting this in a server cabinet, yer gonna hear it with standard hdd's.I have mine syncing with my Google Cloud storage for redundancy of my Google shared files. So anything I add to the share for Google added locally get synced up to the cloud and vice versa to the NAS.There are a lot of apps available for this device. You can run a media server directly from it such as Plex as an app.I get no stuttering when I'm streaming content from this NAS.All around, I'm loving this device and would strongly recommend it. Bit of a learning curve with config/menus, but like I said, gets easier over time.Price point is pretty good too for a rack mount NAS.Hope this helps some of you with your decision making.Some people have stated issues with slow/poor performance, I'd assume some misconfiguration is more likely the cause. If you are going for 10GbE and high performance you gotta make sure your network is configured to handle it and your workstation as well.Good luck to all those in the hunt!

I picked up two of these to split the NAS workload in my test lab and they're great. Easy to setup as always, no issues configuring...anything. They just work!They are my second and third NASes, respectively. I have an old TS-451+ that will be decommissioned to a backup device, but it's been a workhorse. No issues with QNAP and happy to have a couple more of their devices in my environment.

This is a new, late 2017 / early 2018 rack mount NAS that I have purchased. The unit arrived in a cardboard box with two styrofoam for protection. Nothing fancy. It came with the rack mount kits which fits the standard 19" rack with two puller that you can easily mount and dismount from the rack. I paired this NAS with four, 4TB Western Digital NAS drives. Installation was a snap but took overnight to fully initialize the whole setup to RAID 5 with encryption enabled. The fans are very good quality and low noise level.The QTS (QNAP's own OS) contains many features that are so useful, such as VPN (known as QVPN) servers, which can do PPTP, OpenVPN, and L2TP. Surveillance Station that can act as a NVR with two licenses. You have to pay more if you want more cameras to be attached to the NVR which costs around $70 each, which is a bit pricey but you only have to pay once. QNAP has its own app store and more of them are free to download and use. The learning curve is not steep at all but it does require some fundamental technical knowledge as far as networking and storage terminology. Once you get everything setup, you can leave it as it and forget about it.I do not have a SFP+ in my network but the two 1GB NICs are fast enough. It has four USB ports which can attach an external drive, or UPS for monitoring purpose with it.This is a rack mount model, for $550, you can't beat that, especially for its features and small foot print (1U with 12" depth). So, why 4 stars and not 5? There are some areas that should be obvious and not expensive to add on. For instance, at least one of the USB ports can be put on the front for easy access. Why put all 4 in the back? Also, the unit only has 4 HD status, 2 NIC and 1 SFP+ indicator. It'd be super helpful to put a small message enabled display at the front to show relevant NAS info. I also own a QNAP TS-453 Pro and it has all that but it's getting old though, so I upgraded to a newer model.Useful tips: Buy the base model with 2 GB installed and not replace it with a 8gig RAM yourself. If you purchase a 8 GBs RAM installed model, it'd cost $150 more, are you kidding me? You can purchase a 8 GB RAM for less than $40 if you shop around, and it doesn't take much efforts to install it. I have attached some pictures for your reference.If you find this review helpful, please give me a thumbs up. Thank you.Product Update 1: 1/29/2018 -A week after I got this NAS, I noticed that the the remote backup app, named Hybrid Backup app did not work. The symptom was like this, when I attempted to make backup from my new NAS to the old one, I was unable to use the drop down menu to select my old NAS, given that they are in the same subnet. However, if I remove Hybrid Sync app, I was able to use the good old backup/restore app to do scheduled remote backup. I contacted QNAP support a couple of times about this symptom, the first tech I talked to, said I was using a non-supported memory module, which I knew that it was a complete BS. I then talked to the second tech, he, just like the first tech, did several TeamViewer remote session and couldn't figure it out. As of today, there was a release of new Hybrid Sync app, which has fixed this bug instantaneously. Therefore, I feel that the QNAP techs were not informed about this bug or there was an internal communication problem. Should this bugs been caught or flagged, the tech would not have to give the caller run-around. All they had to do, is to report the bug to the development team and debug it. It's a bit frustrating about this little episode but other than that, this unit has still been working great and stable. No other issues spotted so far.Product Update 2: 3/6/2018 -The system has been extremely stable. The only time that I had to restart it, was due to firmware upgrade which restart is always mandatory. I noticed that the restart time can range from 10 to 17 minutes, which was significantly longer than my Intel Celeron based 453-Pro. Last but not least, although the unit has three ventilation fans, it tends to warm up quite a bit if stacked on top of another 1U network unit. It's good idea to leave some space (1/2 U maybe?) on the top of the NAS, which will help to ventilate better.