I also don’t understand the rationale and the feasibility of an unbuy option. It’s 20 dollars and you can try every day 3 minutes. It is already nice conditions. But I agree about the fact that 3 minutes is a little too short to make one’s opinion. 10 minutes would be better.
Concerning the wish: I don’t know if it’s possible, but a real true bypass wet/dry would be nice: guitar in the input A (mono) and output A = Wet / Output B = Dry (and true bypass)