I know this is a necro to a point, but Em-8ER and SC are the two games I'm crowdfunding so this interested me.
My first rule of crowdfunding is to not concern much with timeframes. In the end unless the delay ends up killing the project, it's probably for the best.
SC, well, I will probably be waiting years to fly my javelin. But I have confidence it'll be delivered. The funding is still coming in strong.
Same with Em-8ER. It's gonna be a bit yet before we get into KS. But it's infinitely better that the demo be as good as it possibly can be before that happens. I'm firmly in the "take as long as you need" camp.
Edit: I did have a game I put a thousand bucks in pretty much die on me due to some pretty amazing mismanagement and possible fraud. Best I not say which one though, it's not important. I'll probably update this post when it becomes official.
These things do happen, so I'm not trying to say it's impossible. I definitely consider Em-8ER to be moving in the right direction though. Having a playable product goes a long way to boosting my confidence.