I hope this is a good place to ask this. I'm a long time fan of Champions, and since the 90's have used Champions 4th edition and the 4th edition Hero sourcebook exclusively for my campaigns. I love it.
I have the oppourtunity right now to get a new group and a campaign going, but it looks like they would prefer I use 6th edition. I really am not up for studying a new system, so I was wondering how different the editions are? Is there any compatibility among them? Are any changes mostly big, or are they minor? Anything you might share would be appreciated!