Like many folks, I researched faucets a lot before purchasing this one, from Amazon. It arrived fine and fast. The packaging was fine. I had read the comments / complaints about the miserable installation instructions and thought: (a) surely Kohler must have fixed that issue by now; (b) I'm a pretty handy fellow, I'll probably do fine. Wrong. The instructions, as of about April, 2016, are unimproved - and they are truly horrible. I found an installation video of sorts on YouTube - Kohler had put it up there, I believe. It *was* helpful. However, it never mentioned at all one very important component: there is a white nylon(ish) ring with some small teeth on it, some going up from the plane of the circle and some going down from the plane. This ring was loose in the package when I received it. It was neither on nor near any other part of the stuff in the box. As I was kind of stepping through the installation procedure on my kitchen table, while looking at the video, I saw nothing about that ring. I thought maybe it was just a spacer of some sort that was used in the packaging, but not in the installation. It wasn't explicitly mentioned in the written instructions, nor in the video. Anyway, I installed the faucet without that ring. And that was a mistake. THE RING. The mentioned white ring with little tabs or teeth on it is meant to keep the tall facet assembly aligned correctly on the base plate when you're tightening it down. If you don't put the ring in place, they you will have a very hard time getting the facet to sit perpendicular to the base plate (and to the sink). The off-kilter faucet just looks wrong - and it would probably lead to water intrusion and who knows what other problems over time. After installing the faucet without the ring, I saw this problem, swore a bit, and figured the issue had to be the mysterious ring. I looked back at the video very, very carefully. There is a brief shot of the base place where, if you look hard, you can see a couple of the tabs from said ring sticking up just slightly. Ah ha. I took everything back apart, figured out how the ring "must go" (after some trial and error on the table), and re-installed it. That worked like a charm. A couple of tips for do-it-yourself-installers: 1) I don't think I could have done the installation without a second person. Someone (or something) has to hold the heavy'ish faucet in the right position as you're tightening the assembly from under the sink. 2) Don't forget that stinkin' white ring! (see above) 3) I had to use a lot of plumber's putty around the rim of the base plate in order to get a satisfactory seal. First try, I didn't use enough. That was a drag, because I had to take stuff apart to re-do it. Be generous with your putty! The extra scrapes away easily. 4) Be aware that the base plate included in the box does cover "3 holes" standard type sinks. (This faucet only requires the center hole. the base place covers the other two, if they are there. I believe you can install it fine with only one hole as well.) 5) There is a lot of talk in the comments about a white plastic piece associated with the water feed lines - and whether to leave it in place, remove it, etc. Some people had real consternation with that. The feed lines from the hot & cold water service do have these fairly find little white plastic pieces in them, right at the end that attaches to the corresponding lines that are part of the faucet assembly. Those white pieces must stay in place. They are integral to the connection between the lines (you'll see .. but look carefully, and look for the video on youtube - these are more or less demonstrated there). BUT, there are also clear plastic covers or caps that are on the ends of the water lines coming down from the faucet assembly. Those clear caps (obviously, I think) must be removed. After removing the clear caps the feed lines with their white connector pieces just snap together with the lines coming from the faucet. (the video is your friend. this part was not hard .. but you have to pay pretty close attention.) 6) WATER FLOW ISSUES & HOW I SOLVED IT. Almost forgot. Once I got everything reassembled properly, the cold water flowed strongly, but the hot water came out in a pathetic little trickle. It was maddening, since I had spent a lot of money and, by now, a lot of time putting this together. This problem was really mystifying. My old faucet had very strong water flow for hot & cold. I took apart the water feed line at the turn-off junction (at the wall under the sink) and examined the line the best I could. I saw a little filter element in both of the water feed lines that came with the faucet. My old faucet did not have this. The hot water filter had a couple of very small pieces of plastic that were on the filter. I gently removed those. Reattached. No good - same problem. I took some of the lines apart and tried re-flushing the faucet assembly (including the mixing valve) according to the installation instructions (see video, mentioned). That didn't help. Desperate and truly frustrated, I somehow determined that maybe blowing hard into and through the hot water line might, just might, help. It seemed nutty. I took the line back off at the wall, opened the "turned on" the hot water valve at the faucet (note: not water was coming out because that line was disconnected ... but this opened the valve so air could maybe come thru..), then I climbed back under the sink and blew like hell into that little water line. After a couple of seconds, you could hear some air coming out of the faucet. I blew some more. When I hooked everything back up, the hot water worked fine! (.. and the cold water was still A-OK) Whew. I would have been very, very unhappy if that had not worked. Net: The installation instructions are inexcusably awful and unclear. The hot water flow problem was / is some kind of quality control issue at the factory -- they had gotten some grit or junk up into the line or the valve that I was lucky enough to be able to clear by blowing air through it. And, in use, the faucet after a month works great. I like it a lot - but give it a 2 star review due to the above not-very-acceptable issues. I'm a little worried that the water line connections seem a bit flimsy .. and that they might come apart some day. But, for now, everything is working fine. (after a month or two of use)
