I like how easy it is to get started using it, the documentation is really good and there are plenty of examples to show you how to do different things. The support community is great too! There were some problems with running on AWS EMR when we did an evaluation. We ended up having to use a different framework. It was not ready for production use at that time but it could have been a better fit if they had given us a little more notice. It's still a young project so expect improvements over time. If you're looking for a way to take advantage of big data on the cloud, this is a great option. Using it to develop machine learning algorithms for our customers' needs.