I am a plumber for 46 years and installed hundred's of In Sink Erator products. Many years ago I sold model 770. They averaged 6 or 7 years until the tank would leak. Because price we switched to H100. When my H100 went bad I wanted to replace with the same model only to find you had just changed it. I like the separate tank but the faucet is very disappointing. The spout does not swivel out of the way,And the operating button is on the wrong side for most right handed people.