I, personally, expect Kickstarter projects to be later than their original delivery promises. Especially if the scope expanded due to stretch goals. I've backed about two dozen campaigns at this point, and I'm not sure any of them have delivered "on time".

I'm halfway through running my second kickstarter campaign. I'm hoping to deliver the rewards a lot faster than I did for the first one; I learnt a lot about making and shipping stuff during the first one, and tried to structure the rewards in such a way as to eliminate the biggest time-sink on my end.