Buy it...
I love IL-2 but it's another genre to fly those planes and the 2 games can live together for me
RoF is beautiful and the flight feeling is great in any plane !!
It runs well all maxed out for me and I have a Core2 E8400, an ATI 5770 and 4Gb of DDR3 on win7 64bits
(It starts to slow seriously down with more than 20 planes in the same furball)