It's pretty good isn't it?
I vaguely remember some talk of it on here a while back (didn't read in any detail, it was during my 'too busy in RL phase') but anyhow, I must have retained some good impression, as I bought some, and I'm glad I did.
I use it in place of foundation. There is/was a strangely sparse amount of blurb / instructions on the box / tube, so I'm unsure what it's supposed to do. Or even what BB means. 