Ask HN: is anyone using TokuDB in production?

From reading their website (http://www.tokutek.com/) seems a bit "too good". I was googling around trying to find companies that use it in production but didn't find anything except for the ones listed on tokutek's website.

The main features that interest me are: - Handling large data (>300M rows) - Hot columns & indexes additions - Multiple clustered indexes

Is anyone here using it in production? If so, can you tell a bit about the pros & cons? Did anyone consider it but decided using something else instead? If so, why?