Hey! I've borrowed Mesa Recto cab and did a little shoot-out with my David Laboga 2x12 (also V30). In my opinion difference is huge. Both miced with SM57 and MD421.
Maybe you'd like to hear the result:
Mesa v30s are different to regular v30s so I expect quite a difference, I'll take a listen later.
I'm really after a recto 212 at the mo to replace my Zilla cab.