I keep finding myself looking for things in the Compendium which, unfortunately, are not there yet.
For example: Mythic only has a section under item rarity. But the only mythics I have are staff (physician, master-at-arms, and loremaster). I really have no clue if a Mythic Physician 68 is better or worse than a regular Physician 80.
Bound Beast isn't defined in the Compendium. At this point I've collected quite a few. How are they different from normal races? No clue.
You have a search feature in the compendium. Don't be afraid to put too much info in there. I'd rather have too much than too little. This is a complex game.
Also, I'd rather find the answers to my questions in the Compendium a month from now than have you answer them now. Eg, don't waste time answering me here when you can eventually get the stuff into the Compendium and answer them for everyone.