Hi, and welcome to the forums.
Some folks like the slideouts, but they add a lot of weight to the coach, especially for the room gained. There is also a level of complication involved (more things to break), as well as another source of leaks.
That said, they do add room to the living area, which is a good thing.
Meddle not in the affairs of dragons, for you are crunchy, and taste good with ketchup.