YEs! BoC are one of my top ten favorites.
And yeah, the mood is usually wierd... I'm always fascinated that a song can make me feel ways I've never even imagined... As if they can provoke emotions I've never felt. I love it.

My favorite BoC song: Music Is Math. My first two months or so of smoking, I would play this song every single time. It's a fuckin GREAT song too, not so creepy, until it gets near the end.. But now, everytime I hear it, I feel like i'm getting stoned... I get little flashbacks of the how I used to put on the heater by feet, turn off the lights, and wait for the bass to really start booming to light up the bong...
...Fuckin love Boards of Canada...
Geogaddi is generally one of their best, and Music Has A Right to Children is really beautiful as well.