Any BSD fans out there wish to persuade a happy Debian desktop user to take a BSD for a spin?
If you want to use it as a daily driver, you're probably going to run into some headaches. That being said, if you're willing to put in some time, learn a little bit and forgo some software here and there, you certainly *could* use OpenBSD as a daily driver. One really cool thing about OpenBSD is that the OpenBSD devs use the OS as their daily driver.
You'll likely keep hearing about how good the OpenBSD man pages are. I always thought this was a weird thing to mention and make a big deal about. But holy crap, the OpenBSD documentation is amazing. Reading it has definitely made my own documentation at work significantly better.
The downside? There are a couple. The biggest two are that, 1) you're not going to find a lot of the software you might normally use; and 2) The performance is not great and battery life is not very good.