GSSF is a great way to start competition shooting due to the minimal equipment requirements and simple stages. It's how I got started in competition shooting (13 years ago!) and I still try to get to 1-2 matches a year.
The only issue I've ever had is some very long wait times, so I'd recommend pre-registering for the match and shooting early Sunday morning, if possible.
-Scott
HTTP://TeamGreenbaum.com