I've backed one thing and that was Cinema Purgatorio.
It cost me a relative fortune and then I had to pay another 30 odd quid to get it released from customs.
I received the books after they were actually available in the shops and after reviewing the whole package I think it was just a waste of money and I was foolishly duped into buying something that I didn't really need at all.
I'll be very surprised if I back anything off Kickstarter again. To be honest, I think it's a bit of a con.
I'm slightly of the opinion that If people are good enough and work hard enough they'll get their work out there either self published or using the current available channels, rather than getting the fans to take the hit for them so that they don't have to work hard to raise the funds themselves.
I'm pretty cynical about it all and it would take a creator that I obsessed with to lure me in again.
There's a wealth of choice out there already that I struggle to stay on top of and each time Previews comes out or Comixlogy goes up its like an exercise in restraint for me to avoid ordering all the cool shit I want but know I shouldn't be wasting so much money on.