I started with a Rumble25 this past March. I upgraded to the Rumble100 this summer in preparation for a gig. The DI output to a PA works great using the 1x12" cab on stage as the stage monitor for the bass. Or, in quieter venues, the 100 is more than enough.
I love the Vintage tone shaping control, the Series III Rumble has three shape controls. Bright, Contour and Vintage. I usually have both Bright and Vintage pressed with the bigh meds rolled off just a bit. Most 12" cabs don't do justice to the low B string on a 5-string but the Rumble sure does!
Also the O. I realize lots of people hate on the Fender Overdrive circuit but I love it! It complements the Jim Dunlop flat strings I use, and gives a big, fat fuzzy tone without losing the crispness.
I'd recommend buying the foot switch that comes for it, so you can engage the OD circuit at will.
Unlike what I read online, I've found I can set the Overdrive to fuzz nicely without getting louder than the volume used by the clean channel, it doesn't break up or lose fuzz for me at a lower volume. I just had to play with it a little.
I'd be grateful for a number ...