One note about a slide: Check to see if you can use the bathroom with the slide in.
Some rigs, like the Winnebago Fuse 23A, the slide can be in, and the whole unit can be still used. You can extend the slide for more space, but it is optional.
Other rigs, you can do almost nothing with the slides in.
Another issue with slides is leaks. If they have a top awning, this helps mitigate things, but every 5-7 years, the seals need to be replaced, for the same reason RV tires have to.
Then, there are mechanical issues. Check to see if you can get the slide in via some manual process.
In general, I like slides, as they add significantly to living space. However, each model is different, and some slides may be more of a pain than be useful.