I'll start with my likes (mostly 'cause that's the longer list)...
Right out of the box I liked the look of these things simply because of the unique keyway. You just don't see a lock that looks like this very often around my area so it's got that cool "geek" appeal.
The next thing I did after taking them out of the box and admiring the keyway was (.. wait for it..) try to pick 'em.

The third thing I like is the key. Two reasons for that: Cool looking key, and key control. I like that you can't get keys duplicated (like just about any high security lock). At some point my current house will end up being a rental property and I kinda dig the idea of key control. And for the mean time, I have the coolest looking house key on my block and that suits me just fine.
Overall, these locks seem to be pretty solid, and well worth the money.
My only gripe: Inserting the key in the dark is a near-impossibility. Unlike the crappy Kwikset knockoffs I had on the house before (which had a bevelled surround on the keyway), with the Bilock you basically have to have the key lined up perfectly in order to insert it. With a handful of stuff and a puppy under one arm, in the dark, getting the key in can be a bit of a nightmare. It's a small gripe, but it would be nice if it wasn't such a challenge. It also took a little getting used to to have to give the key that little extra push in before turning, but I've long since forgotten about that and don't even notice that "problem" anymore.
Anyway... that's my thoughts on my Bilock locks.
Cheers,
db