[MacA]

The back of the grip is profiled different. The SF curves in a little further and results in a shorter (3mm??) distance to the trigger. Some folks with smaller hands tend to like the SF model a little better.

Edit: Glocky beat me to it!!

 

[MacA]

To be honest, when I held both the 30 and the 30SF at my gun shop I didn't really feel any difference. I was considering the SF at first until I started reading Glocky's problems with his. I then changed to the std G30.

I think if the G30 feels good in your hands then that is what I would go with!