Hi JCapZano,
Luxisleep is one of about a half a dozen new entries into the “simplified choice” mattress category that I haven’t added yet to the list in the simplified choice topic here. They originally had a different name and website here ADMIN NOTE:Removed 404 page link | Archived Footprint: mileniasleep.com/
before they changed the name from Mileniasleep to Luxisleep.
One of the founders is David Farley who was the CEO of Anatomic Global which is owned by Foamex/FXI which is one of the largest foam pourers/manufacturers in North America along with several other companies in the industry as well. The other founder is Shannon his daughter.
You can see some of the original publicity about them here and here and here ADMIN NOTE:Removed 404 page link | Archived Footprint: examiner.com/article/luxi-is-latest-disruptor-online-mattress-sales[
and here.
They have an innovative design with the three different top layers that you mentioned (thanks for finding out the specs which I didn’t know) that are glued together and enclosed in their own internal cover and can be used in 3 different configurations or firmness levels with either the the latex on top, or flipped with the high performance engineered polyfoam layer on top or with the three layers on the bottom of the mattress (for the firm which would be rarely used). The high performance engineered polyfoam also has a unique design which are somewhat like individual foam springs that act similar to buckling column gel (stiffer at first and then softer as they bend). They also have the option for a side to side split so that each side of a mattress can have a different firmness level and configuration for couples that have different needs and preferences.
As you mentioned the ability to choose 3 different firmness options is less common with the simplified choice mattresses (although there are several others) and the ability to change the firmness at home after a purchase is less common yet… Each side of the mattress can also have a different firmness in the larger sizes for couples that have different needs and preferences.
The 1" of 4 lb memory foam, 1.5" of “mostly synthetic” latex, 3.5" of engineered high performance 4 lb polyfoam and the 3.5" 1.8 lb polyfoam base layer and the organic cotton cover are all good quality materials and there is only 3/4" inch of quilting foam in the cover so there are no lower quality materials or weak links in the mattress that would compromise the durability or useful life of the mattress (although I would add a “slight” caution for those that are in a BMI range of 30 or higher).
They also have a 100 day trial/refund period and a 1000 day period where their sleep specialists will work with their customers as needed to help them with re-configuring or customizing their mattress if that becomes necessary.
While they are a little more costly than some of the other simplified choice mattresses (without their current discount) … The quality of their materials and their unique design would make them one of the “simplified choice” mattresses that I think would be well worth considering.
Thanks again for adding the specs of the mattress 
Phoenix