I recently switched to Vultr from a DigitalOcean and Compose.io setup.
Compose is nice for backups and replicas but they drop the connection like all the time and then the replicas start playing who wants to be master. Which brought downtime to my application at times. Also there expensive so I said f that and manage a Mongo instance myself. Since it was a small project that had to much overhead.
I moved from DO was primarily pricing and the lack of data centers.
Vultr's Miami DC is my jam since I'm in Tampa. Atlanta is nice too.
So far I really like Vultr. 2GB for $10!