Well, I've got FMS, Easyfly, Cockpit Master, Ripmax RC Simulator & G2...

FMS is worth the cost of the software but not the cost of the media or the lead to use it..

Easyfly is fine if you happen to live on a small island and fly a Cap 232 (not much in the choice of planes or scenery).

Ripmax sim is actually good value, mostly because it come with that joystick interface and standard Windows driver which allows you to use your Tx with any PC game or sim.

Cockpit Master is also good value if you can get it at the 'sale' price of around $10.. A good add on to the Ripmax sim otherwise you need to pay over $30 just for a lead...

It's not really easy to put a finger on exactly what it is about G2 that makes it better than the others; It certainly looks better: very detailed landscapes comprising of objects that can be moved around, the perspective just seemed better, more visual clues to help set up landings etc.... or maybe spending $200 on it plus a new graphics card made me take it more seriously

So there it is in a nutshell. I'd hve to brush the dust off some of them and give 'em another go to offer a true comparison...