I bet that thing will be loud though, huh? I bet those fans are only 40mm or something too...
If its quiet though, you could bet it'll keep the card cool.
BFG is a good make in my opinion, though I've never had one. I might think about it though for the next card if i get a 6600GT. I like the fact they are pre-overclocked, though if its Geforce, you can usually use Coolbits to overclock the card that little bit more.
Plus with those cards, you still have a guarantee after a overclock at there pre-set limit.
Though I have no idea how a shop or something would know you've overclocked it unless you changed the bios