I race alot with my buddies and they all use CBP. However, though promatch's customer service sucks there packs are all right I use the 4600 side by side matched packs. honestly i expected more but they aren't bad. To tell the you the truth I got more of a thrill on my 6 cell Orion Rocket Packs. Now for people that are gonna go hating I'm not bashing on Promatch but this is an honest review.