Thanks to everyone for their kind answers. It's really interesting to see other peoples opinion on this topic.

I think the biggest problem (at least for me) was that every now and then a "release date" has been sent that couldn't be met.
I have spent some money the last couple of years on crowd-funding campaigns, with the experience, that many projects can't be done in the estimated time. I am totally fine with that. Most of the people gathering money this way have never dealt with "customer relations" in the past, so they make mistakes.

If a date can't be met, it's okay to say so. Even having the guts to say "fine, many problems we didn't think of occured over time, we can't give you an estimated date when it's done" would be welcome.
But what annoys me a little about the peachy printer is that there have been a dozen of times where it was posted that "it is sooooo close on shipping and we ship in xxx weeks/until xxx months/ in the beginning/in the end of year xxx". I read every update and understand that there are problems that no one could think of in the beginning. But after giving three, four release-dates that couldn't be met, they did the mistake of setting communicating a new time period again and again.

So, this time it's said: "people will receive (..) over the coming months". This would be totally okay with me if it can be met. But it would be a pity if we will be once again disappointed..

To make things short: I am just asking for a realistic release date. After more than two years waiting, I don't care about one or two more months. But don't say 1-2 months if you can't met it. If it's realistic, just say: "by the end of 2016 every funder will have their kit". At least for me that would sound more honest.