Hi Glen
My experience is here
http://community.prostatecanceruk.org/posts/t15908-RT
I kept on being active right through the RT - cycling and hiking - and now, 8 weeks after the end of the RT, I'm back to running too. Had to do the low-fibre diet during the RT (extremely dull and bland food), but now back to my usual very high-fibre stuff.
My experience of sitting in the RT waiting room with other guys suggests that most coped fine with it: there were a few men who were obviously having some issues, but in general, people seemed to cope well.
As you can read, I had lots of misgivings about the RT before I started, but they've turned out to be baseless - it was a very tedious 8 weeks, but it looks as if it was worth it.
Peter