I like it. Some privacy advocates don't like it, but I for one am more paranoid about giving out my SSN. If someone wants your print they could get it from the keyboard you type your password/pin in. You can't lose your finger print, or have it stolen (without knowing it's missing right away). These devices are already pretty good at ignoring 'fakes', and I've seen some that have hea sensors to make sure the 'finger' being read is warm enough to be a persons.
Anyways, in my experience with them they are alright. I would like to have one at home that I could use for my passwords at websites and such. Have my password be a random series of characters and have the reader insert it only after verifying my finger. Would work nice. Same for the ATM... no mor lost cards or trying to keep the guy behind me from seeing my PIN...