Owning all the G-locks and not a fan of single stack sub compacts. I was hesitant regarding the 43, till i rented one for hands on testing. The following day i picked up a 43. added a +2 to the stock mag, second mag had the pinky extension. The stock (flush mount) mag wasn't an issue when shooting, which surprised me. Not feeling any of the "snappy recoil" others mentioned.
I really like the double stack glocks. However, travelling to and through states that like enforcing 10 rd mag limits, the 43 works for me. Once hbar makes me an IWB it should work fine. There's also an issue carrying certain guns wearing a prosthetic that goes all the way up my hip. One more + for the 43 in that aspect.