If I was going to get a replacement for my Drake or Dartmouth, I'd get the Ultramax II. The 1.28 gpf works great. Actually, Toto is working on a 1.0 gpf for release fairly soon! I would strongly advise you to get a new plumber. The one you have doesn't have a clue about toilets. Toto is the largest manufacturer of toilets in the world, they put the old "reliable" American Standards and Kohlers to shame, not mention all of the other name brands from the past. Your man just isn't keeping up with the improvements in low flow designs and who is making them.