Timely. My wife has been researching it and we just had a conversation about this last night. Our deck is very tired. We are going to paint it to get a few more years out of it, then go with TREX. The deck is more of just a way to get to the pool, so it's not big.
That said every she has been reading says DO NO use Behr. Very poor reviews all over, especially on the DIY sites. I had a buddy that used it two years ago and spent the next few weeks stripping it and starting over.