When I bought my house, it came with another brand of toilets that all needed plunged or fiddled with on a several-times-a-week basis. We had multiple plumbers check them out, cleaned, drain-snaked, but it never fixed the ongoing problems. After replacing one with a Kohler Wellworth toilet, I have not had to plunge it once. 

Easy to install. Easy to use. Flushes like a champ, every time. That's all I ever wanted from a toilet.