Hi ollie24018,
First of all … congratulations on making sure that you were able to find out the quality/density of the upper foam layers in your mattress before purchasing it … this can save you a lot of buyers remorse if the foam layers are lower quality/density materials which are much more likely to soften or break down and lead to buying a new mattress much too quickly after a purchase
Unfortunately … the specs of the top layers you listed contain 3.5" of lower quality/density memory foam which is much more than the quality/durability guidelines here would suggest (“no more than about an inch or so of lower quality/density materials” which would include any memory foam less than about 4 lb density or any polyfoam less than about 1.8 lb density) and it’s certainly not a mattress I would consider. Like all the major brands (Sealy, Simmons, or Serta) … I would avoid it and look for a mattress that uses higher quality and more durable materials that will maintain its comfort and support for a reasonable period of time (see the guidelines here).
Phoenix