I've been searching for a dual channel preamp for a while and I finally opted for this one, it is a very good sounding device. I use id on a violin, with microphone and a piezo and it definitely changes the sound for good, it sends a very healthy signal so it is great for both recording and playing live.
I do think it could have a better design, it can be a bit overwhelming to get into the knobs for a first time, but it has everything written on the device, so yeah it needs a bit of patience, but it's manageable, and it comes with it's manual so there's no chance on getting lost.. but yeah, the design could be better, the space for the battery is kinda weird to manipulate.