Yup.
First mod is always to a standard aosp rom asap.
Everything is smoother, better, with more battery life.
Running CM10 nightllies on the S3 and loving it.
Watch out for Christians, they are a murderous bunch of heathens who will destroy everything you know if you don't believe:
http://www.loonwatch.com/wp-content/uploads/2011/10/crusader.jpg
Buddy of mine has one and really wishes he had bought a minivan now.
Cons:
Horrible gas mileage.
Rough suspension.
Loud Rattly engine accompanied by slow acceleration.
Relatively small inside, especially in rear seats.
Pros:
4X4