I was able to spend a little over a week with the Nimbustor 4 for testing and running through ADM, and I am quite pleased with how fluid the interface is with the new hardware behind it. Wait times between menu loading seemed to be decreased from my last experience with the 6302T.
As for build quality, the entire shell of the Nimbustor is plastic, so the unit is quite lightweight and even more with the power supply being external. That said I had no issues with the unit apart from the drive trays sticking and wanting to be difficult, which now that I think of it could be from the lack of a full framed drive in the tray (we used SSDs).
Overall Performance was increased thanks to the 2.5Gbe connection and in most cases, we saw a 75% gain over 1Gbe. Single Client testing showed doubled performance going from 112 MB/s to 279 MB/s with Playback and File Copy and moving over to Sequential performance we saw almost triple the throughput in RAID 0 and 6. Workloads showed the limit of the hardware in RAID 0 while users that take advantage of RAID 5 or 6 will see a larger boost in performance going from 1 to 2.5Gbe.
With the increase in throughput, Asustor has positioned its marketing into an area I've not thought of before. Using iSCSI "gamers" are able to live stream record up to 4K HDR directly to the NAS without affecting game performance, further Asustor has deployed Takeasy RSS to download video from YouTube or Twitch allowing you a personal archive of your channels content.
This, of course, adds to the already massive library of applications that run on ADM along with their comprehensive setup of backup solutions that includes Dropbox, Google drive, one drive and AWS next to hardware solutions like USB or eSATA, FTP and Rsync.
Current, comparable systems would be the DS918+ from Synology and TS473 from Qnap, both of these units hover just north of $600 USD.
The Bottom Line
Asustor raises the bar on mainstream NAS appliances with the Nimbustor 4.