Kudos for the blog... overwhelming amount of information here.
We are headed into a remodel and are considering new toilets in the master and hall baths. Was considering the Drake II Het double cyclone flush for the hall bath, but my wife is concerned about how much noise it would make. We have friends that installed an older 1.6 gpf Drake and found it was a bit noisier than they expected. Any difference in what we could expect from the older to the newer model? Ditto with the Ultramax II Het double cyclone