John,
I'm 17months out of radiation and i can tell you its DEFINITELY worth it!! Yes my life has changed but it is still a life worth living. I just turned 37 in January and i can tell you that my life is just as good as before radiation if not better! You hear about all the negatives and they tend to stay with you and make you scared but i've been through it, survived and is now living life to the fullest knowing that i did everything possible to kick cancer's ass!
I also just had a big piece of fillet steak for dinner tonight, while it didnt taste as good as before - i still enjoyed it!!
i hope my input helps with your decision.