I don't think I'm the person to ask about that. After all, I am a club track racer. We do have a large permanent track in this general area, but I don't make it way out that way too often. So if I give you my impressions, they will be on a 'club track', and from the sounds of it, thats not what your looking for. Most of the guys I see around here with the X12, Evo2, etc... never really get a chance to open them up, they're simply over powered.

Maybe one of the other guys who just got theirs will be able to give you a better reading since they are racing with the big guns like Ron Atomic and other big names on what are apparently REALLY big tracks!

I can share one impression with you though. I ran my $149 Sirio against some of those motors you listed and personally, I wasn't that impressed with them. I often found myself pulling even or ahead of those $300+ engines on the straight(If only my Sirio had the reliability I wanted...). So to be honest, I'm at a loss to understand why people blow so much on them.

But again, thats on a 'club track'. Maybe on one of those 200Ft+ straightaway, World's calibur tracks those things will show their worth. But I ain't seein' whats so special so far!

I'm happy with my $149 Sirio's and now my $139(after coupon) R-Spec!