the only other options are..
akai headrush - too short loop time imo
boss rc-20xl - seems a good option.. quantizing, although some dont like this option
digitech jamman - also looks quite good, and has seperate guitar and mic ins
boss rc-2 - very similar to the rc20xl... makes me think they could do better with the rc-20xl more than anything.
boss dd-20 (sound on sound) bit limiting for a looper
the EH one.. just seems too fiddly to be useable
i havent looked at the line 6 one, i cant decide if i like having dist and effects built in or not.. i think id rather have a few pedals infront of the looper.