In my experience, the radio isn't the problem - it's the crappy headsets, particularly the ones where the PTT button is on the throat. They're an investment, but the Good Call Officiating headsets are a vast, vast improvement, plus it's easier when the button is on your waist. The quality of the mic is what matters most, I think, and the cheaper the headset, the worse the quality.
What I don't like, it the GCO headsets are a vast improvement for everyone who can hear me - but if your whole crew doesn't have them, it's kind of pointless. You won't be able to hear any better until they get a better quality mic.