Yes, I've used those as well. They share the main problems as fingerprints, although forgery is rather more difficult to do.
My favorite biometric of the ones that I've used over the years measured the distances between the joints in your fingers on one hand. It's quick and easy to measure, and is as unique as anything else. But it has the advantage of being much harder to have ruined through accident or injury, and it's very difficult to forge as long as anyone is watching you do the scan.