I'm using it for a few hardware synths that are connected to PC / DAW (through the USB). It's a solid product, and it handles MIDI tasks very well. After a few weeks of use, I had only a few issues when it didn't recognise MIDI IN correctly, and it was overloading Behringer Odyssey: when it was off, all sequencer lights were lightened up. The solution was to turn it on and off and on again. I did some tweaks in the Cubase MIDI setup (my main DAW), and it looks like it's recognizing it correctly so far. So maybe it was a user error.
I'm using additional USB ports for Cubase Dongle (no problems here). iLok was complaining about license issues, so I had to put it dongle back to a USB port on a PC.
Rackmount is not perfect, but it's ok so far.
I can highly recommend it for anyone who needs several MIDI In/Outs