We also used Gerrity Stone in Woburn. They were highly recommended by our architect. They had an excellent selection - make sure you go into the warehouses and select your slabs as they vary widely - and we were really lucky that the one we liked best was mysteriously on sale. They did make one mistake and cut the wrong holes for our faucet, but they made up for it by paying for a new faucet, and we even got them to throw in a small piece of countertop for a small spot that we had missed in the planning.
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