If you run a JR radio, and you want to use FMS, there is a way to do it with a cord you buy at radio shack. Here is what you do. D/L FMS--it's free. Then, D/L a little program called smart propo. Do a google search for smart propo and you'll find it. Now, you install smart propo. This allows you to hook up your JR transmitter into your sound card (the in or mic port on the sound card). This is where the radio shack cable comes in. Go to Radio shack and buy a mini pin to mini pin, monoural stereo cable (it looks like the JR trainer cord--if you already have a Jr trainer cord, use it instead!). Hook one end of the trainer cord (or stereo cable) into your trainer port, and the other end into your mic or input on the sound card. It will work. Now, With windows XP, it actually doesn't work with some systems for some reason (The website explains this). I couldn't get it to work on my desktop, but it worked like a dream on my laptop (both are running windows XP)--go figure that. Anyway, it's worth a try. If it doesn't work, you've lost nothing but a little time. If it does work, then you have a free trainer that you can use your own transmitter with. I now run real flight G2--I bought it because I wanted to use my desktop for flight, and I thought it would be better than FMS. It is better than FMS. Don't buy the G2 lite, though. You can't customize anything with it. I bought g2 when it went on sale as g3 was coming out. I'm glad I did. It works for me, and I saved almost a 100 bucks over the price of g3. I know some people swear by g3, and if I get into big bad 3d flying, I might upgrade. I agree with the above post, you can't hardly hover on g2. The camera angle is always changine, which throws you off, and the physics just aren't good enough (or, maybe the pilot isn't ! ). Anyway, for what I do (practice pattern stuff and aerobatic stuff, takeoffs and landings), I like it. I don't know about aerofly, I've heard good things about it though. If you are going to buy one of these, I would think either one would serve its purpose well.