Hi clymb1,
the first place to start your research for a new mattress is the tutorial post #1 here. It has all the basic information, steps, and guidelines you will need to make the best possible choices.
A mattress is only as good as its construction and the quality of the materials inside it so I would need to know the specific details of all the layers from top to bottom to make any meaningful comments about it. If the retailer or manufacturer can’t or won’t provide you with this information then I would pass the mattress by because the risks of making a completely blind purchase where there is no way to make any meaningful comparisons or assess the mattress for any potential weak links is much too high.
You can read a few general comments about Sherwood Bedding who makes the Evosleep mattresses in post #2 here and post #2 here but the most important part of knowing the relative quality or value of a mattress is by knowing exactly what is inside it.
Phoenix