This toilet was a replacement of original toilet (American Standard) we bought 50 years ago when our house was being built.  I totally LOVE the rapid flush w/ less water use per flush ( we have a well), the sleek lines, chair height and efficiency.  I went w/Kohler because of my experience with the one installed in my girlfriend's house.  The only thing I don't like is the toilet seat.  To start with it is molded plastic (I hate plastic); instead of the gentle slope in the front, (like the wood seats) it has a hard ridge that just hits my thighs.  It is the most uncomfortable seat I have ever used.  I know it is designed to maintain the continuoity of the lines of the toilet, but the designer(s) did not consider comfort first and asthetics second.  Other than that, Kohler has a great reputation for quality and service so I am expecting to get the same 50 years of service and dependability with this new toilet.