I have this sitting between a Motu M2 and a pair of Adam T7V + a Focal sub. Besides the sub out which is an uncommon feature in this price range, I chose it so that I can also route audio from a Nintendo Switch and various Android devices via the Aux and Bluetooth inputs, and have an output available for active home speakers or headphones. The device fulfils this purpose flawlessly with the exception of a minor letdown: switching on Bluetooth switches off wired input, so simultaneous playback of wireless and wired sources is not possible.
I did not want any form of amplification in the device, and I can confirm there's no volume gain beyond what the rest of my rig is set to. There's also no sound alteration or noise that I can detect. Good.
As far as build quality, Presonus don't disappoint. The device has some heft to it, and feels as sturdy as you could hope for a monitor controller under 200€. The stepless volume knob and the buttons are smooth and perfect.
Very pleased with this purchase so far and looking forward to carrying out audio production tasks with it.