I hear you. I can't really disagree. I have no idea which way I am going to go. However, at the end of the summer, I will need to do something since the current bed frame in that location will be used elsewhere. The Lori Wall Bed is an interesting option.It's sort of a "right tool for the right job" kind of thing. In theory, you can use a hammer to drive a screw and you can use the handle of a screwdriver to pound a nail but these aren't the ideal uses for those tools. The same goes for the mattress as a couch back. It'll work, but that's not what it was designed for. As for the "set" issue, you'll still have to deal with it because you're focusing pressure on a relatively small area of the mattress which is not what it was designed to handle. Even though it's not a tremendous amount of pressure over time it will add up. There is always the option of flipping it around though, this helps keep the wear evenly distributed. A firmer, higher quality mattress might hold up better but from a comfort standpoint, in this application anyway, it might not be what you're looking for. Another matter is aesthetics, if having a mattress sticking out of the back of your couch is OK then no big deal but if you want it to look good you'll need to cover it. You'll probably need to cover it anyway because mattress covers (ticking) aren't stain resistant, are hard to clean and will wear more quickly than standard upholstery.
FWIW, I used to work for the largest manufacturer of innersprings and sofa sleeper mechanisms in the world. We were always looking for something more comfortable but the bottom line on the sofa-mechs was cost...most residential customers used them only occasionally so they weren't willing to spend big $$$ for something that might be better than the standard design. There was a sizeable commercial market though in hotels and other rental properties. The problem here though was that even with a lengthy warranty on a "commercial grade" unit, most properties were lucky to get 2 years out of a mechanism because the guests/housekeepers would try to close them with the bedding still inside. This would cause the mechanism to lock up so they would try and force it closed which would blow out not only the mechanism but the couch frame as well. That isn't covered under the warranty so they didn't wan't to pay extra bucks for something that they knew they'd need to replace anyway. There was always a niche market out there for something like you're talking about and perhaps it's growing now with this tiny house bullshit so maybe manufacturers will pay more attention to it.
And you're right, day beds suck unless you're 6, for the same reason...mattresses used as sitting surfaces. We made those too.
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