Yep it's always a risk. This particular company has successfully delivered drones to the market in the past (e.g., MicroDrone 3.0) but you never know for sure until they deliver. But if I were a betting man I'd bet they will deliver something even if it's a bit later than June 2019...How good will it be..I'm not sure. On paper it sounds great. We'll just have to wait and see.
If it's as good as it appears on paper then it might give the Tello and DJI Spark 1 some competition as it seems to fall in between the two.
You're right--it does look very good on paper. Videos look good but can't say for sure they were done with the prototype. Production in June--for backers and retail in October. I'd like to see one "for real" before jumping in.