i had a pair. they will feel extremely flexible if you have ever ridden on better cranks (sugino 75, dura-ace). the rd's are single or double chainring cranks and take a 103mm bottom bracket get a really solid chainline (the 05 pista shipped with rds and a 103mm bottom bracket, in any case). you would be better off buying a used set of shimano ultegra double cranks (older ones -- shimano 600 or whatnot -- that are less ****ing ugly). they will be a lot stiffer and no more or less a "track crank" than the rds. they work well with a 107mm bottom bracket.