there are a couple guys in our flying group who i consider expert modelers and builders. they build trophy class planes,gas,glow and electrics. one is a retired electrical engineer. they both refuse to use 2.4. . they tell me they do not trust the systems as of yet and stick to 72.mhz. we have had some incidents with 2.4 systems failing and the failsafe was the suspect. and talk about older stuff being cheap. a local hobbytown store had some left over older futaba 72 mhz fm dual conversion 7 channel receivers new in the box for $20.00 a piece. a store employee told me 2.4 has taken over and they were clearing out all 72mhz radio equipment.