I'm a user and lover of my V6 for five years. I wouldn't trade it for any amp that I've heard -- ever.
I have a first-hand account from Chris Maersh (Eric Johnson's bass player). He used to be a big V8 fan -- with the 8x10 TE bottom. Truly one of the best "modern old-school" sounds these old ears have experienced. Last year I saw him in Beantown using the new Fender Pro 800 and Fender 8x10. When I asked him what the deal was, he told me that the V8 had reliability issues -- too many breakdowns. He didn't elaborate, but the fact that he switched was big -- mostly because Eric LOVED that V8.
Of course, he tours a LOT, so I'm sure his stuff gets a lot more action than mine! In addition, I blew one of the original power tubes about one year after getting my V6. My amp tech loaded in new tubes and told me that Trace had some "update" modification that was covered under warranty. I don't know what that was, but my amp has been perfect ever since.
In any case, I'm a TE guy. Small gigs, big gigs, I lug that beautiful boat anchor around 'cause the tone can't be beat.