Hi all,
New here, have been following this thread for a while now. Decided to get seriously into bass playing a few months ago (after several years of occasional playing - keyboards & sax are my main instruments) and decided to get a better amp to replace my Line 6 15W Lowdown.
After a few hiccups trying out some Ampeg gear I decided to go with the Rumble, based on the recommendations and enthusiasm of the people on this thread and all the music store employees that I talked to (who all raved about the new Rumble line). Anyways, got myself a V3 200 a few months ago and have been loving this awesome amp! Has enough power for me (home use and church) and I've rarely had to turn the Master up beyond 9 o'clock!
This foray into serious bass playing has also resulted in the purchase of 3 new basses, Origin Effects Cali-76G Compressor and associated cables, straps and stands, of which the Rumble was first!
Have recently ordered the 210 cabinet to go with it for an upcoming performance of a work I was commissioned to write for massed saxophone orchestra (60+ saxes), bass and drums and I think I might need the extra speaker area! Hope I don't get in trouble for mixing a 115 with a 210!

The bass player in my band (that I play keys in) has a GK 115 combo with 210 extension which sounds great, so I'm hoping the same holds true for the Rumbles!
Really enjoying getting into bass playing properly for the first time and the Rumble has been a big part of making this experience enjoyable!