I want to share my experience with Kohler customer support.
I had two Kohler one-piece toilets installed when I remodeled my house 10 years ago. They look good, and have been working ok.
While trying to replace the toilet seats recently, I found both toilets to have the same issue: the bolts on the right won't turn, the bolt on the left would lose up, but then the nut (inaccessible, hidden inside the body of the toilet) would also turn, so the bolts never come off.
Since both toilets have the same exact issue and saw other people complaining about unable to *** the toilet seat on the net, I thought this is very likely a manufacturing/design issue that Kohler have known about it. So I called up Kohler customer support to see if they already have corrective measures developed. After hearing my description of the issue, the CSR claimed Kohler is not ware of the issue, and directed me to buy their ~$50 anchor replacement kit. She was very impatient and quickly ended the call without asking any information.
Now I realize why the Kohler CSR said they were not aware of the problem - they just simply turn any customers who called to buy their kit without recording any information about the issue. Excellent way of avoiding having to recognize "yeah, we may have screwed up"...
I'm about to start remodeling in my newly purchase home, and I know exactly which brand I won't touch.
Monetary Loss: $100.