I went to Guitar Center and tried all the bass amps a few months ago. The M6/M9 was BY FAR the best sounding amp in there. I played around with those SVTs for hours and couldn't get a single desirable sound out of them that I thought was worth the high price tag. The Mesa Carbines were just in a whole different league above the Ampeg, GK, Markbass, SWR, etc. amps they had there IMO.
Honestly, I don't get the hype behind SVTs, I just wasn't digging it, especially after plugging into the Mesa.