No big problems
IMHO the trigger spring on the 30 (and all Glocks) should be replaced annually as part of your preventive maintenance schedule for all your guns, particularly a carry gun. In fact, I replace all springs yearly, I know it seems pretty often, but it makes me feel good, and its cheap.
At the very least, I feel that the recoil spring (and BTW: keep it stock) should absolutely be replaced yearly. It is the one spring that most heavily influences your performance, if the return rate changes even slightly on the recoil spring it will definitely affect follow-ups.
As always, I suggest you shoot any "new" gun as much as you can before buying. The subcompact is a different animal, and its not for everyone.
I guess what I'm sayin' here is: Buy the G30 if you like it. No worries. Its a great gun, and it's a fun gun (soft shooter).
Be safe, have fun.