Bedroom Slide Out--Noise 'n Drafts?

OK, so we're still back in the stone-age. Our fulltime fifth wheel has NO slide outs. Not that we don't want slide outs--we're starting to get the cabin fever syndrome, and the distaff side REALLY wants to have room for company to come over. And when our 20 pound cat stretches out on the living room floor, well, there's just no room for the rest of us to put our feet.

So a question that puzzles us as we slowly make the rounds of dealers and curbstone lots: Is it noisy up in that there bedroom slide out? Is it cold in the winter, hot in the summer?

We saw a few comments from an RV forum who seemed to say, "Depends a lot on the quality of the builder," and "If you get a 'slide topper' it's a whole lot nicer." OK then, real world readers, what are your experiences with bedroom slide outs? And, if you had a slide out without the topper and then added one, did it make much difference? We'll look forward to your scholarly replies!