Genz Benz Shuttle (or Shuttle Max) -- I happen to have the Shuttle 9.0 -- with an Epifani 3x10 cabinet works for me!!!
FWIW, I'm really enjoying my GB Shuttle 9.0 - what a terrific amp. I marvel at the sound, and then giggle like a schoolgirl at every load-in/out. These days I'm mostly using one or two Bergantino HT112ER cabs, and I'm really enjoying the sound. Plenty of oomph - to the extent there's occasionally too much low end - and amazing tone that cuts but still maintains the character of the bass. My RV5 sounds terrific through this rig, as does the M5-24...even though I still prefer the Epifani cabs with that bass.
Yes, that Shuttle 9.0 is a fantastic amp, isn't it? Once I got my passive (1966 Jazz Bass) and active (Sadowsky NYC 24-5) settings dialed-in, it's one awesome "set it and forget it" setup!