At the risk of being accused of being a spammer i will say this anyway....
A G27 can easily be controlled with the use of an Agrip™ grip on the gun... no finger extention needed, although the finger extentions definitely improve control.
With Agrip, the G27 will not change position in your hand at all when firing, even with the hottest of rounds, although of course it will kick, and Agrip works even better with sweaty hands.
I was actually able to shoot from the hip with a G27 and walk the bullets right into the head of a silouete target from about 8 ft, and hold them there and empty the gun, just like pointing a water hose. In addition, much to my amazement I was able to out-shoot my G20 with the G27, and that is saying ALOT from such a short barreled gun. Both guns had Agrip, and the G20 had a Harrts recoil reducer, but I think it just goes to show how much more accurate the new Glocks are, as the G27 kicked WAY more than the G20.
Personally i think the G27 is a great little gun, although i just bought a G29 to go with my G20, and the G29 is a piece of cake to shoot one handed too.
Sorry to sound like "Joe Sales"....
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Reality ALWAYS takes precedence.