Hmmm
Rearview,
I have both G2 and Cockpit Master BE. I've never tried FMS.
My opinion...
If you are into computers then I would recommend it. It's about 4 computer games (in cost). I pull it out every week or so to play around and I use it to practice specific things (I'm still pretty new, so its a short list) like rolls and landings (lots of landings).
Not to upset anyone, I think there is a group of "old timers" who underestimate the value of a sim to a never before flown pilot. I saw this pretty clearly at my club this summer. On the other hand, I wouldn't EVER recommend that someone could learn to fly a gas trainer with just a sim.
However, as was said in another post, G2 isn't particularly good for electrics. I actually got Cockpit Master before G2 and taught myself to fly a slowflyer (Merlin) with it. I used a 2 joystick gamepad to control it, and found that was nearly as good as having a real radio in terms of learning how to deal with plane orientation.
So, I would recommend it if buying a $200 computer game isn't that big a deal to you.
GB
PS Oh, and despite being able to handle a parkflyer and having G2, it still took me quite a few flights on a buddy box to get the hang of a gas trainer.
Have fun...