Glad to hear they took care of you!
I do have to express the same thoughts about Marquis. Our 05 Epic shell developed a few small cracks along the outside edge of the shell. One of these cracks went from the edge, over the top lip and across the top of the shell and towards the inside. The crack was probably 4 inches long and was at the time only cosmetic (it had quite a ways to go before entering water level) yet a call to the local Marquis store followed up by some pictures of the crack ended in us getting a new 09 model Epic for the cost of delivery only.
I do believe that Marquis is very proactive in taking care of their customers and I would recommend their spas to anyone.