Well, the G3OS is no PPC or Bullseye pistol, but for a subcompact it certainly delivers the goods.
The G3OS is a much more compact pistol, and while you might regret having "only" 10 rounds in a magazine, you can always use G21 magazines as reloads.
While I didn't have a G30 or 30SF to compare it to, by my calculations the G3OS slide could be as much as 5.5 ounces less than the aforementioned models.
That weight loss would go a long way to explaining the snappy recoil I experienced and is something you might want to be aware of if you are considering the G3OS as your main carry gun.
As for accuracy, I suspect the accuracy experienced by most shooters will be more influenced by the recoil than by the inherent accuracy of any given G3OS. Make no mistake; it comes back at you.
As a main carry gun, the G3OS is going to fulfill all the desires of any Glock aficionado in that it will be nearly indestructible and utterly reliable.