I think they degrade the iPad touch experience. If fingerprints are a bother, a microfiber cloth cleans them up easily, once or twice a day. A soft wet cloth may be used to get rid of tough prints or smudgtes.
Still a bother, get a nice slippery stylus. I got one on ebay for 11 cents shipped! It came with an earphone plug and cable, so that it is always close and doesn't get lost.