Hi Tennisman,
IMO … Restava is among the better online memory foam options (listed in post #12 here) and meets the guidelines I use for memory foam mattresses which are listed in post #10 here.
The salesperson only gave you “partly accurate” information though. The top layer of the Regina is a type of memory foam that has a gel material added into the memory foam so it’s actually “gel memory foam” but it’s still in the memory foam category. You can see more information about the different types of gel memory foam in post #2 here.
Quilting a foam in a cover pre-compresses the foam and will make it firmer than it would be if it was a loose layer. This is a fairly common construction (covers that are quilted with a foam or fiber material). The quilting is just another layer of the mattress and would be part of the feel and performance of the mattress. Their gel memory foam has a density of is 4.2 lbs which is a medium density so it has 2" of gel memory foam and 2" of “regular” memory foam underneath it for a total of 4" of memory foam over the base polyfoam layer.
When you are buying a mattress online it can certainly help to have some way of knowing how the mattress compares to a mattress you have tested and the basis for their comparisons. The Regina is not directly comparable to the Contour signature in terms of the memory foam layers (the Tempur Contour has two layers totalling 4" of 5.3 lb memory foam) but they may be comparing it in terms of its “feel” which may be comparable. The accuracy of 'feel" comparisons may depend on the type of testing they did and who the testers were that compared it to the Tempurpedic. I would certainly test the Contour Signature though to see how if feels and performs for you and how suitable it may be for your needs and preferences.
They do have a return policy which pays for shipping both ways and offers a full refund if you decide to return it so there would be less risk involved if you did decide to return it although of course the goal is to make a choice that you would want to keep instead of having to start all over again with a return.
There may also be some good local options available to you where you can actually purchase a mattress you have tested which of course is the least risky type of purchase. If you let me know the city or zip where you live I’d be happy to let you know of any I’m aware of.
Phoenix