Since a few weeks I'm using the Windows Hello system on my new Surface Pro 4. Its using facial recognition, and it's pretty awesome: turn on the PC, sit still for a second, it greets you, logs in and you can work. For two factor logins I use the Microsoft Account app on Android, which also works very well (no typing a code, just approve the request on the phone).

Now only if Microsoft would fix the power/sleep issues with Surface 4, it would be perfect.

Of course, it makes the assumption that "<user>'s face in front of the computer means <user> wants to log in", which may not always be the case.

That being said, I'm eagerly looking forward to reading about its pitfalls once people crack it.

I've read it is very accurate: even twins who look very much alike won't fool it.

But it still has some funny characteristics: if you train it for two people/faces (you can scan multiple times), it will happily let both people log into the account.

Another gotcha: if I go for a coffee I usually lock my PC (Windows-L). If I then go too slowly, it will recognize me again and log me back in, leaving the pc unlocked.

It's like the technological version of "Go the fuck to sleep" I suppose.

Load the newly updated Intel display driver.

Don't forget that today's iris scan, using Daugman's algorithm are the gold standard in biometric technology.