John Butler is amazing. I've been to a couple of his sessions when he was playing in pubs down here before he got famous!
And I could say that I have been playing guitar for about 25 years. But It's actually more like 1 years experience 25 times I'd play like mad for weeks, then not touch it for months - and have to relearn everything again. My own version of groundhog day for the guitar.
I was lucky enough to see them a few years ago in the states. They were completely unknown there. One of my Aussie buddies said "You have to see these guys" and I saw them in a small club with maybe 100 people in it. Amazing.