I've used one. It's not what I would have chosen.
I have to deal with real consumers.
I don't think you will plug an Aqua-Saver, but I did find that it schredded toilet paper and after the first flush, it would float back up.
For a completly clean bowl, it sometimes needed two flushes.
I don't like having to flush twice to leave clean water in the bowl.
Maybe CR should start testing these things in homes.
Last week I sold a Drake to replace a 2 year old Eljer Aqua Saver that needed interior tank frepairs.
If you need repairs, you can call:
W/C Technologies toll free at 888-PF2-WCTC