Briggs Vacuity works great
I know I'm the only happy Briggs customer, but here goes.
I bought the Vacuity 4408 (?) identicl to the CR review, must have been about 2003-ish. Love it, works great. Have 2 old Mansfields water wasters that don't work 1/2 as well - they have plungers next to them. Briggs - no leaks, no noises, flush great - no plunger in the room.
From that experience, during a remodel I replaced my in-laws' toilet with the Briggs Aegeis. She's at least 250 LBs, he's well over 300. No complaints, and I can only imagine the workload they impose on that appliance. (And they might not complain to me, but my wife would make sure I heard all about it being my fault.)
My wife's been begging me to replace the Mansfields so she can ditch the plungers!