I've loved it at my company. It seems like development best practices + sanity enforcement outside of it and it's fairly flexible too (we use kanban instead of scrum).

It's done wonders for putting the planning of how things should be implemented into the hands of developers themselves and then essentially gets out of the way.

One thing is you need 100% collocated experienced people who know what they are doing - no third party agencies who spend 15 mins discussing pixel separation in photoshop mock-ups.

It also not something you'd carelessly throw a junior or an intern into