After playing (and struggling with) a fair amount of Burning Wheel, and then getting to play Mouse Guard earlier this year, I thought I'd never go back to the denser, difficulter BW rules.
But the new Adventure Burner is really inspiring me. I haven't made it through the whole book yet, but what I have read is solid stuff.
My favorite bit is from right near the beginning: "The game of Burning Wheel is about undertaking the role of a persona who is in crisis".
That's great character advice! Almost every BW character I've created burned or played in a game with has had goals and beliefs and relationships and all that great stuff, but being "in crisis" is an eye-opener for me. I think maybe a lot of the characters in my past games were missing that element.
Also, Luke Crane's writing in this book is great; authoritative and explanatory, but personable and engaging. I think it's one of the best-written RPG texts since Dogs in the Vineyard. (Also he has stopped over-using the word "potent", which always drove me buggy.)