I spend somewhere around $30-40k / yr on AWS (EC2) for a 3 member replica set.
I evaluated DocumentDB and price wasn’t the issue (at our scale, the price is OK).
Main blocker is that it’s locked at Mongo 3.4 API compatibility, which is several major versions behind. But worse, their implementation of the 3.4 API is incomplete, so while they advertise “Mongo Compatible”, it really isn’t a drop in replacement.
I evaluated DocumentDB and price wasn’t the issue (at our scale, the price is OK).
Main blocker is that it’s locked at Mongo 3.4 API compatibility, which is several major versions behind. But worse, their implementation of the 3.4 API is incomplete, so while they advertise “Mongo Compatible”, it really isn’t a drop in replacement.