You have made a wise choice.
I can think of no better subcompact self defense autoloader than the Glock G27.
Why?
Glock makes very reliable weapons,
The .40S&W round is a very effective self-defense caliber,
9+1 rounds of .40S&W (10+1 with a Pearce extension) is great capacity in a sub-compact weapon,
Easy to maintain and easy to trouble-shoot and repair...parts can be bought and replaced by just about anyone,
Very light weight for the size and capacity,
The G27 is a rather soft shooter for a subcompact .40 pistol,
"Drop in" barrels are readily available if one wants to convert it to a .357Sig or a 9mm Para,
The trigger-pull can be made heavier or lighter by the user for less than $30.00 dollars (no gunsmith required),
And there are plenty of accessories available too.
Enjoy!