Great build quality, great price, simple setup.
The toneprint app could be better, because you can't edit the settings there, only on the desktop software.
I found a few presets that are useable, the stock preset might be even the best (or one of). However, most presets can get really aggressive, so beware.
I wouldn't call it 'studio grade' as it is advertised, but if used for some gentle compression, it works perfectly.