Unless you have a high-end expensive video card don't get G5 or G4.5. Been there done that.

I tried the G5 demo and it ran OK but....
I just installed G5 on my system a few days ago. While AFPD, XLR, G4 and Phoenix work and look great, G5 looks awful and is very jerky (and so did G4.5). Even with all the graphics turned down it is jerky. I know what KE/RF says...Buy a couple hundred dollar video card... but that is not what it says on the box (same problem I had as G4.5). This is the second RF that I hate. G4.5 was IMHO junk compared to G4 and so is G5.
RF G4 was the best sim IMHO.