If you are willing to spend 1100 on the mlily, why not get a new S&F at costco for the same price. First of all it is a decent mattress with a good coil system. Costco has the ultimate in return policy. You can bring it back after a year and you are golden. Not a big Casper fan, materials sourced from everywhere, some like it despite that, but S&F seem like a more solid choice and it is medium feel, which will be good for the mrs. Personally, I like the S&F and since these are all relatively budget mattresses, I would consider a latex topper for your back issues. The S&F does have some pressure relieving tempur memory foam, but as you heat up the mattress you may find yourself sinking and a bit hot. The latex topper may eliviate some of that. The Mrs. will probably not even notice the difference while you get the relief you need.
I would add that the Tencel fabric of the Stearns and Foster is a great breathable material. If possible I would avoid any floor models or any mattress you suspect might be a return simply because it could have been in the field or showroom for several months.
Thank you for your reply. Reached out to the store in person and they had several brand name mattresses sealed in bags. Asked them warranty/return policy and basically cash with no warranty. Also stated they weren’t returns but rather manufacturer cosmetic defects. Red flags everywhere lol.
I was looking at usa prices on the S&F and it was just under $1100 USD. I guess the conversation in Canada kicks it up in Canadian $. S&F is still a reliable brand. The Mlily is a Chinese brand and the ortho line is meant to be a bit firmer. Better for back and stomach sleepers. Depending on what you like, side sleepers could find it firm. They have partnered with the Manchester soccer team, which has offered them a bit of exposure since 2016. They started in 2003 in china and, by 2011, expanded quite a bit from the Chinese market.