i had a 35' motorhome for several years. it had a big ford 460 in it, so it was a gas hog. i never left the state in it, but traveled frequently to local state parks..lots of good memories. it was a '90, so now slide-outs, but it was a 'side aisle', which made for more rear bedroom privacy, although that probably mattered little to me..i had a gf, but no kids to have to 'hide from'. i sold it for a couple thousand less than i paid for it, which was okay by me..i sold it and bought a house instead. living in it got pretty cramped after a couple years, but some people manage it very well. but at 6'2" and 240, i was bumping into things quite a bit.
for travel i think they're great..you stay in your own place, cook and eat your own food..and generally other rv'ers are good company when doing walks around the parks. it's nice to not have the added pressure of 'checkout times', etc.
ryan