I'm not saying the crc doesn't perform, just that their battery retension system is sketchy at best. On track I found my rev.4 and ck 3.2 to drive equally well, but in my book the rev.4 wins due to its more secure battery retension. Now if your good enough to not clip any dots, pipes, burms or bumps the o-ring will work just fine. The o-ring system was a good idea when they came up with it but the cells we use now are much heavier than the 1400s back then and it just isn't strong enough for the extra weight.