We have the jack knife sofa in 2014 198rd. our 9 yr old son sleeps on it and likes it. Honestly can't see myself sleeping on it and I am only 5ft tall., barely bigger than hobbit size. The cushion on back and cushion on seat are not the same so there is a gap when you open it to bed and that is the main discomfort I can see. But he is fine for now. Good luck! 6 ft tall friend sleeps on their dinette (same as ours) at a diagonal. The dinette is bigger than the jackknife bed.
Bonnie, Jim & Twin Kidlets
Uptrailered '99 Trail-lite Bantam 17' Hybrid for
2014 Jayco Swift 198RD
2007 Dodge Ram 1500 Quad Cab 4x4 Hemi
Eaz WDH w/sway bar