We have a 24ft with a slide, it has broken twice, in the last 18 years. Both times it was a 10 cent roll pin.
We like a slide, and would not want a small rig without one. (even taking into account the problems we have had) Our slide is a Swintech, which is actually a pretty simple mechanism, once you understand how it works.
But, as a nod to those who don't like slides, this. last time I had my cousin help me fix it. Now he is a 40 year machinist, one of those guys who built his own airplane, can fix anything. His comment was, not very well engineered, built just about as cheap, as possible. Which as a long time RV owner did not surprise me in the least, considering how they build the rest of the rig.
But in my opinion the good things about a slide outweigh the bad, at least for us. Others of course may reach a different conclusion