In 1992 the U.S. government mandated that all toilets sold after 1994 cannot consume more than 6 liters (1.6 gallons) per flush. What they didn't consider was that a traditionally designed gravity-fed 6L toilet isn't good for *you-know-what* when it comes to effectively flushing away solid waste.
When we remodeled our bathroom about 15 years ago, I purchased an American Standard gravity low-flow toilet from Home Depot (because that's all they had), and it clogged the FIRST time I used it. I wanted my old toilet back! I called the manufacturer who basically admitted that low-flow toilets deliver a weak flush and that most people end up having to flush at least twice to get the job done. Unacceptable!
I returned that toilet, did some research with consumer reports and found -- at the time -- that the Gerber pressure-assist toilets were the ONLY low-flow toilets top rated to get the job done, first time, every time, with one flush. Our Flushmate toilet has worked flawlessly for 15 years. I NEVER have to use a plunger. Pure physics dictates that an unmodified gravity-fed flush of only 1.6 gallons doesn't provide enough pressure and volume to reliably remove solid waste. Having to use a plunger to unclog excrement on a regular basis is not my idea of fun. No way--I love my Gerber Flushmate toilet.
Got the recall kit and installed just the U-band because the stupid pressure regulator won't fit. The water supply valve is in the way. Will have to do, it's been fine for 15 years and whatever happens we've already gotten our money's worth out of this toilet... I can't recommend it enough.