I read, many years ago, that the slide is #1/at the top of the list of things to give trouble.
Most likely they have improved a lot, but I'll bet that they are still at the top.
We had avoided having a slide until 2012, when we bought a new mh, and I figured by that time it would be hard to find a new mh without a slide.
We just made sure that when we were on the road we could stop and spend the night in it without putting the slide out.
Our slide is just the dinette, and it does give more room. But the mh is useable without the slide out.
Dusty