I hafto say I havn't used either a racegun or sandridge but I did read the review of the sandy F5 and it sounded outstanding and the race gun when bought as part of the marker to start with is way cheaper than getting it as an addon, Iwould like to try em both just to compare the feel (I remember trying an angel 2 years ago and the trigger was very naff put me way off angels until I tried the one on display at planet and have revised my opinion, badly maintained Angels are not good well maintained ones are sweet) but I'm sticking with my Impy ( can't afford anything new now ) ( WDP sponsership every paintbalers dream ( or nightmare ) )