I've been gigging exclusively with my Walkabout and HD212 for about 6 months. Coincidentally, I bought a M6 as a backup for larger gigs because a lot of people on this forum mentioned the lack volume being an issue with these heads. So far, I haven't needed the M6 and that includes an outdoor show that I did last night. I play in larger clubs in Tahoe and Reno. These are shows with FOH, though. We have two guitars and fiddle player in the group and we play a lot of new country with some songs that remind me of hard rock. Not quite as balls out, of course, but close. We all need to hear everything on stage, especially vocals, so I have to say that the guitarists don't drown anyone out onstage.
That being said, if everyone in your group is balls out loud I don't know if this rig would work. If your guitarists and drummer are into playing at appropriate volumes then you have no worries.
This is an amazing rig. It has a huge sound and I'm totally happy. I play active 5 strings, btw.