If you're talking about the FNAR 7.62x51mm, they look great and I've heard nothing but good things about them. I haven't personally fired one, so everything I could say is second-hand. :?
The one drawback to them, is that they appear to use a proprietary magazine made by FN for their Patrol Bolt Rifles, so using a M14 or FAL (metric or not)magazine isn't an option.
If I were going to buy one, I'd stock up on magazines now.