I have ridden dozens of ebikes for reviews, and spoken to many more people who own them. Truth is, there are no bargains in this industry. You get what you pay for. If it is cheap, it is lower quality, quite simple. You need to compare bikes at a similar price point.
That is, until someone invents a new technology which I don't see happening any time soon, and when they do, their technology will need to be more expensive.
So when you see a Kickstarter or Indiegogo that claims to be revolutionizing anything, it's just false marketing.