Yeah I have a problem! Just picked up a GB Shuttle 6.2 for $359 @ Geartree when I sold my GK MB500 for $350 on craigslist... Couldnt pass up that deal. The MB500 was a bit too hissy when not being played and a VERY aggressive amp which was not a good pairing for aggressive GK NEO 15s. The 6.2 Shuttle is warmer than the GK MB500 but I would still call it fairly aggressive. Volume wise these 2 are pretty equal & plenty strong enough to push the 2 15s. The Shuttlemax 9.2 & shuttle 6.2 tonally are very close obviously. Deep but tight lows. VERY versatile amps, they can do warm & aggressive. . I'm VERY happy at the volume I'm getting out of the 6.2. Its a perfect small amp to throw in the gear bag for a backup to the 9.2max. I prefer both amps with GK NEO 12s which are more neutral than GK NEO 15s which have a ton of mid content I have to EQ out sometimes. The 9.2 max with all the EQ, tone shaping pedal, 3 channels, is the best amp ever made PERIOD especially for a cover band who needs to get near the original artist tone in a hurry. The 9.2max is quieter when not playing (less hiss) at a similar volume Streamliner... I was able to really A\B this with the shuttle back n forth. Clearly more "warm" & mid scooped for sure, less hiss & treble content. A FANTASTIC solution for cabs that have too much mid honk \ mid aggression such as these GK NEO 115s. Is not as versatile as either amp but does what it does better than the others... warm thick clean bass. ALL amps: Aux in for playing music through the speakers or with headphones is clutch. The DI is clean, clear & hiss free with pre\post which is essential. Any amp without pre\post DI is an automatic fail in my book (I run pre). Build quality is fantastic, built like tanks. vs the old 6.0 9.0 12.0: I had a 12.0 briefly. The low end was too grindy & it really didn't get super warm... kinda like the GK MB500. The new .2 versions are clearly an improvement in that department. Genz Benz: Gonna miss you guys... Andy, Jeff... very helpful dudes & can't wait to see what you make happen in the future! Thanks for curing the amp gas!