I specifically opted out of the fingerprint reader when I bought my Lenovo T420 Thinkpad last year. I spent a little time researching them before the purchase and found so many problems with so many readers that I wouldn't feel safe using one, even if it didn't have any currently known vulnerabilities.

On the other hand, for most people, with a different convenience:security ratio than mine, they're probably still fine. I was specifically trying to build a secure laptop.