The best thing about nettty was its simplicity in building applications, it has made development very easy for me as compared to other frameworks like Spring or Struts2 etc., which are too complicated at times when you want something simple but powerful enough with all features available out of box without any dependencies from external libraries/frameworks (like JPA). I have been working only one year now so far using this product; however i can say that there's nothing much bad here except some minor bugs sometimes while running your code locally(in Eclipse IDE) because if run outside eclipse then everything works fine! Try before buying!! Its really worth every penny spent. It helped us build our web service faster than ever by making use simpler coding techniques rather writing lots & complex codes again nagain!!