I've had no bad experiences with Spank - on the firing end that is - stuffs a b*tch to get off ur clothes though.
Flies straight enough in my experience too, get a decent ball-to-barrel match and you'll be fine. With regard to using it as a tournament paint the Jags used it a while back - if its good enough for them, its good enough for us.
Yesterday at a tourney i was shooting draxxus all day, though one of our Angels was blowing it to pieces so he started using Spank I believe and that paid dividends... If its kept in good conditions it seems to work fine.
Say what you want, you're entitled to your opinion, but I hardly think its fair to lay into Jack "AJ" Austin - I saw him playing when he used it and they were flying straight enough. When its minus 2 degrees outside, you want a decent solid paint.
With regard to it sweating in Summer... its a winter paint :-/ why would anyone use it in summer?