They are both good radios so no, you didn't make a mistake. Spectrums had a problem early on with rebooting if the voltage went too low on the reciever. That's a user error which should never happen anyway, but Spectrum updated their recievers to reboot much faster so an inadequate battery won't cause a crash. And yes, every component in these airplanes can fail and no, no manufacturer will replace your plane if they do. Do a range check and a loaded voltmeter battery check before flying, and you should have no problems.