I've been using Rotortech Scott Gray F3C blades (Red ones) on my Vibe90SG since I built the model a few months ago and they have been truely outstanding. However, I've recently given the Radix F3C/FAI blades a try (the gold colour ones) and I've been pleasently surprised by how good they are. The RT blades are very marginally better in fast forward flight, but the roll rate when using the Radix is very slightly better.
All in all there is hardly anything to choose between the two makes of blade, other than the fact that generally the Radix blades are a little bit cheaper to buy.
I doubt very much that any F3C/FAI pilot would be disappointed with either type. This might have been covered in an earlier post, so my apologies if this is the case, but I thought my experiences might help anyone struggling to make a choice between the two.
Rave ENV Electric Beast X v3 FBL, Rave Ballistic BeastX v3, T-Rex 500 Beast X FBL