I wear the old style armour, 'cause I can't find a turtle suit that is remotely comfortable. I don't think I have unusual proportions (well, maybe a somewhat oversized belly...), but both the 661 and Dainese stuff felt really uncomfortable (and not around the belly...).
And I'd gone in with the intention of buying a turtle suit, so it wasn't like I was making excuses for letting my wallet talk me out of it. Hell, Anna was there offering to pay for half the total cost if I upgraded to the better version of the 661 suit, and I still couldn't bear the thought of wearing something so uncomfortable.
So, I'm sticking with my old style armour, although I'm looking into the addition of a road-race style back-protector underneath.
Gotta do something about my elbow guards though - they were the initial motivation for looking at the turtle suits, because they keep slipping down. I can race-tape them to my arms and they stay put, but...