you gotta have very deep pockets and someone to teach you on how to fly them
they are a flying brick they dont glide very well
ive flow a couple of lookalikes prop driven of course, they are hard youve got to keep the speed up or else you are in trouble
as for turbines they were at my time when i was in the RC game was very expensive
not to mention the cost of decent remote control
what it is worth these days i wouldnt have a clue