Hi triton0226,
There is nothing about the Tempurpedic materials … patented or otherwise … that make them inherently better or worse than any other similar materials of the same quality/density although there are certainly differences between the properties of different types of memory foam made by different manufacturers that some people may prefer over others (see post #9 here and post #8 here).
There is more about the different ways to choose a mattress (online or locally) that can help you assess and minimize the risks of each of them in post #2 here and there is also more about the most important parts of the “value” of a mattress purchase in post #13 here that can help you make more meaningful comparisons between different mattresses.
It would be tough for most people to justify the cost of a Tempurpedic when there are so many other options available that use the same or even higher quality materials which is one of the reasons I would generally suggest avoiding them (see the guidelines here).
Phoenix