Hi, it's hard to tell the difference between the TEH and the OTA but in general the quality of the plastic on the OTA is miles better than the clone. The earlier TEH was a really poor quality but the recent ones have been far better. I do believe however that the genuine OTA had Phillips head screws rather than the hex heads on the TEH. Have a look on R2 hobbies, they sell the TEH R31 and other versions of it. Since it has an upgrade kit the problems with the TEH are most likely solved so you probably wouldn't see much of a difference quality wise anyway. Hope this helped.