Well, all I can say about the milestone rule is that the adventure has pre-set points for level ups. I have not got quite far enough with any group to know how well they work to be honest though, but I believe they are balanced well. And as people have been mostly leaning towards the milestone rule, I'm adopting that one for use.

We are only missing two intro posts and I have been in contact with the players and according to what they've told we should have them up soon.