As you can see in my photo, the button fell off, and kept falling off until one day we didn't notice and it was lost permanently. Kohler wants over $100 for Part Number: 1346768-VS, the entire spray kit.
6/19/2023 Kohler support emailed me an they are mailing me a free new spray kit.

Only issue was the supply hoses were too short for me. Had to get extensions.
Good feel to handle. Removed aerator to get better, good, flow. Recommended.

We installed this faucet in 2011 to replace another much more expensive model from a different manufacturer we had installed when we did a remodel in 2005. The Kohler Forte, while not as cool looking as our previous faucet. has worked out much much better. The previous one had issues with its pull out faucet head and was harder to switch between spray and regular flow. Also the previous one had a much lower flow rate due to its fancy design. The Kohler Forte was still not as fast a flow rate as a "regular" faucet (we had one before our remodel) since it has a hose through which all the water flows, but the flow rate is significantly more than our previous fancy model. We notice flow rate a lot as we refill many gallon jugs of water every week. The Kohler Forte faucet has been very dependable and reliable for us with very smooth action. Over the years the faucet had become harder and harder to turn side to side. In 2020 thanks to Kohler's well done maintenance video "KOHLER Forte Pull-Out Kitchen Sink Faucet O-Ring and Bearing Replacement", we were able to see how to service the faucet bearing. The problem really turned out to be that over a long period water gets into the area where the faucet turns and can leave mineral deposits behind. So we did not need to replace the bearing or o-ring but simply clean off the mineral deposits from the inside of the faucet and bearing, lube the bearing with silicone plumbing grease, reinstall the existing bearing and o-ring, and voila -- the faucet turns side to side easily again. We are very happy with this faucet, its reliability, and its ease of use -- especially being able to turn the faucet on and off with a forearm or elbow if our hands are messy or we want to avoid cross contamination. One other note is that this faucet is much easier to install as you just need normal tools and not a special basin wrench (which can also be a pain to use).

Install 6/10/2022 was easy. Clear Directions. 1 screw on retainer with 2 Phillips screws and 3 hose connections. One problem - water supply lines were to short at about 23" - needed 12" extensions for $6 each (at Home Depot--Brasscraft 3/8 in. Compression x 3/8 in. O.D. Compression x 12 in. Braided Polymer Faucet Connector -- there is a Youtube Video that explains this and recommends this part). Then instead of using the supplied pull-out hose weight I reused the pull-out hose spring from my old faucet - no weight to rattle around or get stuck and better pull back. Faucet construction appears to be all metal as per specifications. Would have given this 5 starts but the 1.5gpm water volume is just satisfactory - would be 5 stars if a higher flow volume.

Well made and looks great but the faucet comes way too far into a conventional bathroom sink. Be sure to check the measurements.