Just to put my 2p in...
I rode the Bridgestones till they needed changing. I heard what people were saying and it was happening to me..the following ruts in the road and other stuff. I changed to the Metzelers. They weren't the cheapest, but I'd heard nothing bad. The difference was remarkable. I could throw the bike around corners in ways that I didn't think were possible before. OK so my riding style was better than when I first got the bike, but all the same.
Cut to 6 months later. Some prat has hit my beloved, but a very nice man has lent me an America (he still at the time of writing hasn't ridden it). The only problem, the man he's bought it from lives 100 miles away. No problem. I'll ride it back from there. Am I sure...? Course I am. But it's got those bloody Bridgestones on. I'm back to following grooves in the road. And I don't mean the ones coming from my iPod. And not throwing one round a corner.
And when I pick the shiny new one this week, that will have bloody Bridgestones on too... but they'll have to stay. I have plans for that one, and I'll be skint after buying the flaming thing anyway.

Change them...? I would when they need doing. But you'll be able to tell the difference. And wonder why you didn't before. I did.

Gina 03 America - Pretty stock - except the TBS wheel... 06 America - missing, presumed in bits. With it's TBS wheel... 09 America - It's very blue....