MongoHQ have a pretty awesome product. The only concern I have with them is I noticed they recently capped databases to 20 gig but that's 3x more than my leaderboards come to at the moment so that's future-me's problem.
The custom data on the leaderboards and levels is just ridiculously easy, it's basically just copying object properties/values on the user end straight in to document properties/values in MongoDB.
The custom data on the leaderboards and levels is just ridiculously easy, it's basically just copying object properties/values on the user end straight in to document properties/values in MongoDB.