i am of the firm belief that on the standard 1911 in 45 acp, a comp is useless for about 99% of the people who own them. they wouldn't be able to tell the difference in recoil anyways. most people might say they want recoil reduction, but truth be told they want their pistol to look cool.
i have seen kids and women shoot 45's with no problems. if you can't handle the recoil of a 45 acp, go find something smaller. hell, my wife shoots mine and they don't bother her!
about the only 1911's IMO that need a comp, are conversions to a larger caliber or competition pistols where a trained shooter knows the difference and a micro second might mean the difference between winning or losing. other than that, they are for looks and are pretty useless.