I paid 379 euro for this and you get what you pay for really. In terms of construction it seems fine: pots are solid, buttons are fine, faders are a little wobbly but I think that's just the plastic fader "cap" on top of the actual metal thing that slides (oh I know all the terminology, me!). Note on my mixer the LED effect display near the top right his red not blue.
The problem is that the USB on this desk is not good. It seems like an afterthought rather than an integral part of the design.
1. You can't alter the volume of the audio coming in from USB and it's massively too loud. You have to lower the sound on the PC and hope to god you or an app never turns it back up or you will be deafened.
2. To hear the audio coming in from USB over the main outputs of the desk you have to press the "USB to main" button but doing that means the main mix is no longer sent from the desk over the USB out (to avoid feedback I suppose). This makes the seemingly simple scenario of playing a drum track on your DAW and jamming along to it on a keyboard plugged into the mixer and recording it over the desk's USB output impossible. The only way to do it is to listen on headphones on the desk, the main output of the desk will only be playing the synth you have plugged in (the main mix); the audio coming in over USB (your drum track playing in your DAW) will be muted.
There are other issues I'm having but I've only had the desk I day so I could be doing something wrong.