22500 Dual Stereo Looper : Feedback pleasure

It's been years since I've tried to get hold of a hardware looper to substitute some functions only found in software loopers without paying a fortune. More than one tracks, choise between independent and synced tracks and feedback control(stated as overdub function in 22500). Other features such as reverse and tempo and pitch change found also in many cheaper units are OK but are more like gimmicks that I wouldn't often use. This is a serious live composing instrument. The only gripes I have is that build finish is a little on the homemade side and the power supply puzzled me a bit as it says center positive but I believe it's just a missprint of the OEM chinese market adapter that came with the 22500