Hmm, I’ve had one bad experience out of 5… The bad has at least delivered some of it’s product.
3 of the 4 good ones were Burning Wheel Codex, Torchbearer, and Middermark, all of which were basically BWHQ replacing it’s home grown Summer Secret Surprise pre-ordering with Kickstarter. Absolutely the best experience.
The other success, which HAS been delayed, but has delivered most of the product now, is the Classic RuneQuest Kickstarter.
I don’t mind naming the bad experience, the City State of the Invincible Overlord Kickstarter. It has delivered most of the stretch goal PDF maps, and they do keep us in the loop about progress even if it’s glacially slow.