DOD FX25, DOD FX25B, Q-Tron (big box) Q-Tron Mini, Q-Tron Nano, Q-tron +, Chunk Systems Agent 00Funk (a close second, but mostly because is sooooo much smaller), and a couple of Donner micro pedals (a purple one and a white one). All of them did what I needed them to, but the meatball is just incredibly flexible; I can set it for any sound from any bass.