Augur is the best example. It's live, and works very similarly to how it was conceived. It's slow and relatively expensive (1-2% per transaction), but that was

Augur is the best example. It's live, and works very similarly to how it was conceived. It's slow and relatively expensive (1-2% per transaction), but that was the plan all along, get something out there that can be improved and iterated on. they have a roadmap in place to make it faster and cheaper. They have pushed out like 8 or so updates since going live in July.