Shape Up: Stop Running in Circles and Ship Work That Matters

I'm considering implementing part of this at work. It feels less ritualistic than scrum, and leaner for a small organization. The 'appetite' concept brings out the discussion of cost (time) vs (business) value. I feel this is often lost in scrum, where putting something on the backlog and estimating its size are often consecutive. Does HN have any experience with this framework?