Hi Lawsonmh15,
[quote]Me: 6’0" tall and fluctuate in weight from around 200-250lbs depending on the season. Just coming out of hibernation so I’m tippin’ the scales closer to 250. I’m about 80% back and 20% left side. Blue eyes, dirty blonde hair and I’m a pisces.
The Wife: Buxom lass with a bit of an attitude. She’s 5’6" and working off some baby-weight so she’s tippin the scales at about 170, but typically weighs in around 140. She’s a big-time side sleeper, not much tummy-time (buxom remember) and a bit of time on her back.
Hope this helps as it’s all I’ve got…[/quote]
That’s probably plenty … except of course the time of day you were born and the length of the middle toe on your left foot. 
On a more serious note … their memory foam models use 3 lb memory foam which is on the bottom end of the quality/durability scale for memory foam. Once you are over 200 lbs … then memory foams that are 5 lbs or higher are a much better choice. Even 4 lbs or higher would be a much better choice in a very low budget mattress although I would question the wisdom of this as well. To their credit they do use higher quality polyfoam in their support core under the memory foam.
Promotions of one type or another tend to be “ongoing” and are nothing special. they are an ongoing way to create a sense of urgency.
Their regular memory foam mattresses are in no way comparable to a quality memory foam mattresses which use higher quality materials. Their FAQ is very misleading and inaccurate although it is true that lower density memory foams will often be faster responding and less temperature sensitive. Many types of memory foam have these same qualities though at a higher density.
Gel memory foams are an emerging technology and there are quite a few variants … some better than others. They don’t list the density of the gel foam but they do say it is an infused type which would indicate that it would probably be more durable than a similar density memory foam without the gel. I am also guessing that it is infused in low quality memory foam.
Given the lower density/quality of the memory foam in their regular models … I would personally be very hesitant in purchasing this mattress.
Some guidelines for buying a memory foam mattress are in post #10 here.
There are many better and less risky choices that use known better quality materials and some of them are in post #12 here.
My personal tendency is to avoid materials which are either unknown or where someone I trust hasn’t seen the specs and can validate the durability of the materials.
Phoenix
PS: I would also tend to look for a local factory direct manufacturer where you can actually test the mattress you are buying and where you can count on high quality materials and good value. This may be particularly important because with your weight differential you may have very different needs from each other and it may either be worthwhile considering a side by side “split” construction (each side layered differently) or be able to test a mattress to make sure it is suitable for the both of you. If you let me know the city you live in I can take a look to see if there are any that I know about.