Hi volcano,
Gardner makes some very high quality mattresses and I think highly of them. They are knowledgeable, experienced, and transparent and they are certainly well worth considering if you are in the Boston area. You can see some of my thoughts about them in post #8 here and a forum search on Gardner (you can just click this) will bring up more feedback about them as well (although it will also bring up some posts about Gardners with an āsā which is a retailer and a different company).
Phoenix