If you arent in to flying betas, wait. If you want to mess around, get familiar with it or just want a new place and plane to fly then go for it.
Or if you don't like starting and then waiting for ages, don't start.
Personally, I don't have issues with beta. If ED sold it with a guarantee of a 1-2 year development proces or-your-money-back and ED had a better track record of meeting its own deadlines, I'd be in. If it was later in the development phase, say 70-80% and sold as early access/beta, I'd be in.