My experiences are similar to most folks it seems......
My 21sf stays on the night stand (with surefire light attached) as I trust it to work if I ever need to pick it up in the middle of the night.
VERY soft shooter of 45s
100% reliable so far and track record indicates it will be.
The 13 round mags fit in the Glock 30
I'm 6', medium build and it feels sturdy in my hands
For me anyway, it is far to large and heavy for concealed carry. I know others can pull it off, but it is just too much for me.
If someone MADE me only get one Glock (perish the thought!), I would get the 30 so you can conceal carry and use a spare 21 mag for extra bullets.
But believe me, these are the kind of problems you WANT to have!