And, also by some kit drummers as well—usually hard rock or metal-type drummers, though the odd popular-style drummer will use them. I don’t know if Ricky Lawson still uses a Kevlar head.
And, just a few years ago a company was marketing these for normal drumkit use, in various models. The company didn’t last, though; speculation suggests that the heads lasted too long to turn a profit for the company.
They aren’t without certain disadvantages, though. For one, I absolutely dislike the ‘crack’ sound they make when tuned tightly in marching bands (which is the fashion these days; easier to play intricate figures, I guess). Secondly, they feel like hell when used on a snare drum and cranked for durability—they feel exactly like a piece of wood. This non-giving nature can easily lead to tendonitis and CTS.