Hi Joetrain,
As you know I think very highly of Comfort Sleep Systems and they are a member here which means that I believe they compete well with the best in the industry in terms of their quality, value, service, and transparency. Posts #2 and #5 here and the posts it links to also includes more comments and feedback about them as well.
Most of their mattresses have 10 or 20 year warranties but a quick call will provide you with any specifics that you need about the warranty on any of their mattresses because they may vary. I would also keep in mind that a warranty only covers manufacturing defects … not the loss of comfort and support over time or the useful life of a mattress (see post #174 here).
Knowing the type and quality of the materials in a mattress (see the guidelines here) is generally more important than the length of a warranty because any manufacturing defects will tend to show up early in the life of a mattress (usually within the first year or two) but the quality of the materials will be a much better indication about the useful life of a mattress relative to each person.
I now that they can make adjustments to their mattresses if a customer needs to make any changes to their mattress and some of their mattresses have exchangeable layers as well. I don’t know the time frame involved but a quick call to them would also give you all the specifics about the options they have available after a purchase.
Post #2 here also includes some of the other options and possibilities I’m aware of in the Connecticut area as well.
Phoenix