Water closets are now available at 1.28 gpf. Water savings are only good if the systems work. Is there experience out there with these fixtures, either good or bad that we can learn from. I would be concerned in public use buildings and buildings with long horizontal runs. I would be less concerned in buildings with stacked fixtures in close proximity such as core groups of washrooms in an office building.  Any pipe sizing or configuration particular to these low flow fixtures.  Feedback would be appreciated.