RC-2 user here! i really solves some "butas" problems in our band during gigs.
i had a choice between the RC-20 and the RC-2, and for me, the latter is preferable because it can do the things the former could do, only in a smaller and compact pedal size rather than the twin pedal size.
and it has more memory. the RC-20 only has 5 mins and 30 seconds of recording time, whereas the RC-2 has 16 mins total, 11 programmable tracks which you can save.
although i think you have to "cha-cha" less with the RC-20 since it has 2 switches.
...and screw tone suck!
i can use a looper before it if it really ticked me off.