Some people say they sound too scooped and prefer the mid hump of the V30's but I like either or. It's almost a mood thing which is why alot of people mix the two speakers for the best of both. The G12-T75's are awesome speakers for any style of playing; clean, rock and metal. Being in a 4x12, you'll find they will like that little extra shove of volume to find their sweet spots.
Edit: Just like the V30s, the G12-T75's are also great recording speakers, and as Nep pointed out, also sound great broken in (or fresh out of the box). I hated recording my Eminence speakers. Never could get the mids to not sound overbearing without taking the "magic" out of the sound.