I bought one pre solo, and it was awful. I could not fly a pattern in the thing. Granted, single monitor, so not the best setup, but still, if I flew the real plane as I was flying the simulator my instructor would kick me out of it mid air. Even after solo I crashed landed almost every time, it just felt weird.
I put it away and wrote it off as money wasted.
Then, after my first cross country (where I wasn't stellar in keeping the nav log updated), I decided to fly my second in the sim before going in for real.
I have to say it really helped, great practice. Of course, I got "lost" in the second leg because it was missing some pretty big lakes I used as checkpoints, but it's also good practice for doing things like VOR intersections.
So what everyone said, for procedures, but it doesn't fly like the real thing.