I'd like to second that opinion. The MC505 is truly amazing. The only think I do not like about the 505 is the way it handles MIDI in the RPS section and the manual truly sucks. I've been using a R8 as a percussion module since 1991. It appears the R8 will play second fiddle to the MC505.

The new Yamaha RMx1 is on the horizon but I cannot see how it could even compete with the 505.