So I just got my Loupedeck today and spent about an hour editing some photos.
The good - The knobs are great, pressing to reset is great, white balance even goes back to the "as shot" settings, although it says custom. You feel like Dr Dre adjusting a few knobs at a time. They are laid out in a logical fashion but will take some time before you can use them without looking.
The big crop and rotate knob isn't granular enough to be very effective and I found I had to go back to keyboard and mouse to get the results I wanted.
The bad - the keys are absolutely worthless. If you press them on the left or right edge they just rock, they sometimes work if you hit them in the top or bottom middle of the keys. But you need to hit them in the middle in order to make them work. It doesn't get better from there though as the keys are mushy. I didn't expect Apple like keys but for $300 I'd be happy with Dell keys.
As one of my primary reasons for buying this was culling, flagging and staring I have no choice but to send it back.