If you would have gone through my previous posts, I have mentioned that I a firmware developer that is I develop custom roms. So this may come as a shock as a person who is in this business is not upto date with the development of the android world. Well I have some points for the same and this is why even you should consider holding on to kitkat for a bit more time.
Xposed is a hell big thing to be covered in even 10 posts!! I would be doing it in a series fashion and will be talking about individual, modules in the continued series posts.
Xposed framework is undoubtedly the best android project ever! I have been in contact with android for almost three years now and have never ever seen a project developed at this pace. The amount of participation it gets and the impact it has had on the community as whole!