We just got the G600s installed in our fleet. They are very nice and handy! I have plenty of G1000 time so the transition was pretty easy. But if you've never flown glass, it'll be a little tricky at first, but once you get the hang of it, you'll find out how simplistic everything becomes. I definitely recommend downloading the sim from the garmin website to get used to where everything is at.
Just remember.. the G500, I assume is just like our 600, is slaved TO the 530/430.. NOT the other way around. You'll have your moving map and flight plan page and what not on the 500, but you have to enter in the information into the 430 first.