RD spl elite is relabeled Atomic APX... basically it's an SJA build. I hear that Pro Comp and RD use higher quality steel though which does make a difference in motor strength effecting output a little //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif and probably cone control so SQ may be slightly better also. BUT I have only heard this... never used one. only Atomic I've owned was a 1st gen AP 12" and it was decent. pretty hard to blow for sure. I've heard people claim drop in swap gains with RD and Pro Comp over Atomic //content.invisioncic.com/y282845/emoticons/biggrin.gif.d71a5d36fcbab170f2364c9f2e3946cb.gif