Im was using a spektrum 2.4 DX3R, but had nothing but problems with Spektrum stuff, unbinding, lost signal for my boats many times. Wont buy spektrum stuff again.
I had a Airtronics m11 2.4 and never had a problem.
Right now Im using a Futaba 3pks on FM, and havent had a problem yet. Everyone uses 2.4 now so the chances of interferance are slim to none.