I've only owned four or so model "G's". In regards to how they fit / sit's on my wrist. It's not so much about the case design, but the strap's notch would either be too loose or tight on my wrist. However, the most comfortable "G's" where the strap fits near perfect was my Rescue, and my present 5600 that a friend (toxicavenger) gave me this past Christmas.
I also went as far as modding the bracelet on my TaWaTec Titan Ti Diver. I fitted / installed one of Boschett's ratcheting buckles to it. Now it fits near perfect.
Aside from Ted Su's strap's retaining moisture (which makes it uncomfortable to wear during he summer months). His dive buckle is awesome! Perfect winter strap and buckle!
So what's your's?