For the summer holidays my son used his birthday cash to buy a Quanli Thunderbird RC glider from an online seller called Booth Enterprises, which appears to be a one man band working as an agent for Nitrotek.
The glider was delivered with an intermittent fault, the wires from the battery pack (via a Molex type connector) would work the motor and servos on the kitchen table but the slightest 'wiggle' on the wires would cut the power. On a couple of occasions we thought we'd fixed it but less than a second in the air and it failed again, nose diving and breaking the none too substantial wings. We were told to return it to Nitrotek (at my expense).
After some delay Nitrotek told me no fault had been found, and they will not return the glider to me without me paying a further