The ease at which one can use hazel cast in their project makes it very impressive.I would say this is best platform if you want to build real time application or web services using java language.It's really easy to learn and implement. I have not found any major problem so far. This was my first experience with hazel cast but i feel it's very helpful tool for developing projects. If anyone wants to develop real time app, webservice etc., he should go for hazel cast. Real-time streaming analytics has been our most important area of focus since we started working with this product.The ability to process huge amount of data without compromising the read/write speeds is amazing.