There was a discussion on the two a little while back. I have the E2 and have shot the Evo. Here is my review:    Fitting:  I fitted my E2 last night to a STI frame and the grip slid right on. No filing, no forcing .. nice and easy. I also tried it on a CK Arms frame and that would of required me break out the files to get it to go on, but it didn't seem like much would've been needed. I did however have to file a bit in the trigger area (not the bow .. that fit perfectly) to get