Just one thing I have noticed (with off-road at least) is that I can't tell a lick of difference between the Airtronics FH2 and FH3 receivers. The FH3 are supposed to be faster, but I have both and they feel exactly the same. You can get used FH2 RXs for around $30-35 if you keep your eyes peeled. It's a great way to save money and stay with Airtronics. I'm actually thinking about selling the FH3 RXs I have and use the funds elsewhere.