RE: nitroplanes.com
The planes are pretty good for the price, have a pair of Sig Seniorita's & a Piper L-4. As mentioned above, the instructions on the L-4 were pretty bad so if you are not comfortable in figuring things out & doing workarounds, except for the Seniorita which is the SIG plane, pass them by. Additionally customer service is a major customer disservice.
Best access for any kind of problem is on the customer help forum here, forget trying phone or email.