I have. Totally worth it. You'll need the part number of the faucet which I found on a tag of one of the supply lines. Also the approximate date of the installation. Think I just paid ~$13 for shipping the faucet head/sprayer. More on reddit.com

I am an authorized dealer/tech for both Kohler and Generac. Kohler has more than their fair share of issues. A big point that I dislike about them is their OnCue system. When it works it is fine, but they are dodgy and Kohler likes to update their servers without telling anybody causing issues in the field. It also isn't wifi enabled (they sell wifi modules but that's another part to break) meaning software updates have to be done via USB or their Sitetech software. I have also noticed the QC of them recently declining. Parts missing from the factory, wiring mislabeled, no oil, hot/ground reversed for a battery charging circuit. I swap more RDC2 controllers than I do Evolution controllers. Now, having said all that, the Kohler's aesthetically are much more pleasing. The engines are higher quality, which is important down the line for the life of the unit. They are even offering custom colors on their units soon. Generacs are easier to install and maintain (IMO) but as stated by you and the comment above, there are rising concerns in QC and customer service can be a pain if you don't have an authorized dealer/service provider to act as an intermediary. I have had to deal with more maintenance and servicing on Generac engines rather than the electrical components. Both have about the same quality ATX, Kohler being the nicer looking one. You can do just about the same with each. Exception being Generac's SMM which is neat but I find they happen to always go out right after their warranty expires. Having said all that, if your installation is done by certified technicians, including a plumber who has their wits about them on the gas portion and you maintain the generator at the proper service intervals, both will treat you right. More on reddit.com