I have two full size receivers and three T-amps. I use the receivers most of the time. Was thinking to have a third setup, but never did. So my T-amps do not get much use.
The Gizmo was only tested for a few hours. It has been sitting in the closet forever. No major cosmetic defects and excellent working condition. No distortion issues in my computer setup. Comes with original box and power supply. $old
The Sonic Impact T-amp gen 2 has only 50 hours for occasional portable use.
No major cosmetic defect, perfect working condition. Comes with original box and power supply.$old
I used to have quite a few feedback at avs123 forum, also 396 (100% positive) ebay feedback (user ID: edeal2006), and tons of feedback at head-fi.org (user ID: andychen).

