Kohler 26347 9 BN Anthem™ Three Outlet Recessed Mechanical Thermostatic Valve Control Review 

Agreed. I bought this product and had problems with the valves right away. Kohler knows this and sent replacement parts for free, but look online and this thing has a lot of bad reviews. Their engineering seems to be pretty bad these days.

Have do disagree with you on Kohler. Though their products often look beautiful and are made with plenty of metal parts they tend to provide very poor installation instructions and worse, their products can be unnecessarily complicated and lacking in sound engineering fundamentals. I pity the poor souls that will be tasked with servicing this stuff as it ages. As a 30 year plumber I would NEVER choose their product.