Hi Benstark,
Hopefully you’ve had the chance to read the mattress shopping tutorial here which has all the basic information, steps, and guidelines that you will need to make the best possible choice in any budget range.
Based on their site it seems that they only sell lower end King Koil mattresses so your odds of finding a mattress that uses good quality materials there are probably relatively low.
There is more about the most important parts of the “value” of a mattress purchase in post #13 here but outside of PPP (Posture and alignment, Pressure relief, and Personal preferences) … a mattress is only as good as the quality of the materials inside it regardless of the name of the manufacturer on the label and I certainly wouldn’t consider any mattress where you aren’t able to find out the information you need to make an informed choice.
I can’t make any meaningful comments about a mattress without the information listed in this article and it’s unlikely that they would meet the guidelines here but if you can find out and list the specifics of the materials and components inside any of their mattresses you are considering I’d be happy to make some comments about the quality of the materials or help you identify any weak links in the mattress.
I would avoid any mattress where you aren’t able to find out this information (see the guidelines here).
Phoenix