I bought this to jam with backing tracks, and with 99 tracks and 60 minute loop time and unlimited dubs, i didn't think this was going to be a problem. However there is hardly any space on it! I fit 5-6 tracks, which I had to cut down quite a bit.
The tracks also have to be 16-bit wav files which doesn't help, little surprised it doesn't recognise mp3.
Also it would be nice to have some indication of the file name on screen, or at the very least keep the file name on the device when you reconnect it to your computer. It renames them back to "Track (X)", which I found annoying.
The pedal itself is small, sturdy and seems well built.
Overall i'm pretty disappointed with it, especially from what it promised it could be.