First off: I'm impressed.
Aside from that the software seems to be working nicely these are a few points that I really appreciate:
(this is from a Linux server, Windows client perspective, and mostly my first impressions)
* Generous and trouble free trial-version. (I believe this is a much stronger motivator for purchasing than most think)
* The user experience is excellent, ability to auto-mount and instant feedback when you connect/disconnect devices is fantastic and just what I wished for, even being able to pull a device from another client and script changes is even more than I dared to wish for (but exactly what I want).
(* No installation is refreshing and gives a pleasant first impression)
I had a few crashes/exceptions that seem to be related to right clicking in the client GUI (Win 10 64 bit v. 3.3.5, server 2.6.7, I don't know how to replicate this reliably) but apart from that the software has been stable and it really didn't distract me.
So, I went to the Purchase page and here I got some concerns.
You should be more clear that the license is tied to a physical server. You mention "unlimited USB devices on a single server" - it is in no way clear from that that the license is not transferable (which I've only verified by googling on this forum).
Also, for my usecase I know I will soon have to reinstall my server, possibly change Linux distribution and install the OS on a different type of storage device. Will I need a new license for that? I have no idea.
What can I change in my setup without risking having to buy a new product? I'm very well aware that this might partly be sensitive information but not a single mention about it anywhere(?) is alarming and off-putting.
Is the purchase completely automated? (=> can I start using it without restrictions immediately?)
These are basic questions that I really want answered before purchasing but could not find any information about after looking around on this site (apologies if I'm just blind...).
Also, it took a while to find out about this software. You might want to consider adwords for 'usb over ethernet' and similar. I almost missed you even after googling a fair bit on different solutions.