Honestly I doubt that this time they will not deliver their products. They made big mistakes but that's what they were IMO, mistakes, not scams. They have every interest to deliver, because a second round of mistakes would be deadly for them. Having said that, problem is not that they don't deliver IMO, problem is quality control. How good will the quality be this time? (the first Eve had lots of quality issues).
Personally I won't put any money in the project before some long term reviews and I don't care about " price will continue rising periodically as the product gets closer to shipping. "
I think they deserve a second chance, but at the same time they don't deserve that people pay in advance (even if fan will do it anyway at their own risk). If the Eve 2 turns out to be really good, I'll wait a good sale, but won't buy in advance nor at full price, since I dislike their policy.