I'd suggest getting hold of a couple of carbons and shooting them before buying a dozen. I guarantee you'll feel a good bit more recoil and vibration from your bow than you do now. Enough that you may not care to make the switch. But then, there's that speed thing and that is awfully addictive.

Another thing, if your bow is more than 7-8 years old and has been shot with heavy arrows it's entire career, I wouldn't recommend switching at all.