In my pre-PPL teenage years when I had time on my hands (wife and kids saw to that...) I used to do a bit of simming. Nothing serious but now and again. CS757 was a very poor product IMO. Buggy as hell and very questionable handling. I battled with it for a while before giving up. Wasn't much fun trying to get it to work. Best add-on I ever had was the Dreamfleet 727. Very realistic and never came across any bugs.