I love how it's easy to write your programs, that is very intuitive from scratch. The IDE runs well even with my ancient laptop (1 GHZ intel Atom). Also if you need help or have any question they are always there to answer quickly. Sometimes when using certain programming libraries like openCV for example, it might be slow sometimes. For me this makes sense but maybe other people could have better performance. But overall its great. My applications have gotten exponentially faster since I started using QBC.