Hi buttercupbety,
Absolutely 
SleepEz is a member here which means I think very highly of them and that they compete well with the best in the industry.
I also think highly of Brandon at Sleeping Organic (sleepingorganic) who is also very knowledgeable and helpful and is also a member here.
Once you know the materials that are in a mattress (in the case of latex the type and blend of the latex and the details of the cover) you are in a much better position to make apples to apples comparisons and evaluate the “value” of a mattress purchase based on your personal value equation which is all the objective, subjective, and intangible factors that are most important to you in a mattress purchase. In the case of the two you mentioned you are certainly choosing between “good and good” which means a final choice can be difficult (which is a lot better position to be in than when a final choice is easy because one mattress is clearly lower quality or value).
That’s especially true when $3500 buys you a lower quality mattress with a less flexible and customizable design than the $2400
I’m looking forward to your feedback when you receive everything.
Phoenix