Hosted Graphite has been a game changer for us at Cotap. We have been customers since 2013 and no matter how many metrics or requests we send their way, they can handle the load. They are moving fast, constantly adding new features and iterating over the existing ones.
Their support is also amazing, everytime we've had an issue or a simple question they'd respond the same day, often the same hour.
There is no way we would go back to hosting our own Graphite stack after using them.