After having used an E-Frame I decided against it as it was a bit to large for my taste. So I purchased the Racegun frame with the A.C.E. eye. After about 30 minutes installing the thing I plugged it into my computer and installed the RIP software. The software is incredible. You can program every aspect of the firing and recocking procedure. You can even program how the marker fires. Semi-auto(when you pull the trigger it fires and recocks without having to release the trigger), classical mode(tradional marker functionality), sniper mode(when you pull the triger the marker fires but does not begin the recock procedure until you fully release the trigger allowing as much gas as possible to hit the ball alowing you to run the gun at stupid low pressure), and full auto. The trigger on the frame itself is very adjustable. Not so much as the E-Frame but still it's adjustable. If you have a low pressure cocker this frame will allow you to lower your pressure even more (I was able to lower mine from 230psi to 200psi). If your cocker is fast this thing will make it faster and without ever breakin a ball if you get the A.C.E. The one down side to the product is that without a Palm Pilot or laptop you can only change one configuration modification without having a Palm Pilot or laptop on the field.
Unless you absolutely need to change your firing settings while on the field then this frame owns the E-Frame. Also contrary to popular belief both the E-Frame and the Racegun do both use the same SMC valve so they are both as fast for recocking. Bit aside from that this frame is incredible. It has almost no down sides and will increase the reliability of any cocker it is attached to.