My brother had a 2005 TT with no slide. When he went to sell it, almost every person calling asked if it had a slide. People in general want slides. Resale might be an issue down the road without one. Myself personally, I wouldn't buy any rv without one. Makes a world of difference in useable space. If someone is cooking, you have to turn sideways to pass in the kitchen without a slide. More the merrier for me too. The only ones I might be hesitant about are full wall slides, and possibly kitchen slides that all the plumbing has to flex every time the slide goes in and out.