I bought an RC helicopter as a Christmas gift, boxing day the rear rotor failed. I contacted Nitrotek who told me to take it apart and fiddle with it and if that didn't work to send i back for a bit of professional fiddling. I sent the item back (at my cost) asking for a refund because it was not fit for purpose. I was informed the item had been damaged in the post and I needed to pay for the repairs.
I would not recommend buying from this company!