| Will be interesting to see/hear when they become available.
They come with only 10 pre-recorded rhythm tracks. AND they combine bass and drums AND there is no way to remove the bass and just have the drums. So, as compared to the many drum tracks of the RC-2 that is a negative - yeah, I know the drum tracks are not all that great. BUT, better than nothing. That said, seem to be lots of potential with the Jamman in terms of ability to add drum tracks, etc. via your PC.
Personally, I really like the RC-2. For us guys not in a band or who like to practice without one it is great though. YMMV.
Knowing Boss, a RC-3 can't be far behind though.....
__________________
Short-Scale Six-String Bass Club
The Official SansAmp VT-Bass Owners Club
The Acoustic (Amp) Club | 
