Works great. No fog in the am anymore.This works great. It was also a giant pain in the ass to adhere it to my helmet. Took about an hour to get it on there after looking up tons of video guides where they just slap it right on without needing any adjustment. It took a ton of adjustment and it was hard as hell to adjust the pins on my helmet (HJC CL-17). I even made a little scratch on my visor when the pliers slipped off the pin. Now, you can get helmets with push pins, so I am not docking a star from the lens for this, but just keep in mind that this might not be a quick 5 minute job like all the reviews make it seem. I thoroughly hated this lens for how difficult it was to put on my visor.Once I got it on there with a good seal though, it works great. No more fogging on my visor no matter the temperature or my breathing. I ordered one of these after riding to work on a cold morning and my visor fogging up immediately. I've had this for a couple months and there's been no fogging. If my visor ever gets too scratched or broken I will be very sad because I really don't want to ever have to put one of these on again.Eliminating fog is what it does and was my top priority, however, I can see obvious variations in the plastic. I almost thought there was another clear plastic sheet to peel off, but indeed there wasn't. I can still see okay, but frustrating for the price. Should be perfect!Regarding the install, I am an apparel designer and have worked with sewing opposite facing curves of different lengths together....it is very counter-intuitive but it works! This lens install is exactly the same, it curves out the wrong way and feels wrong trying to bend it in, but you are doing it correct! Don't overthink it and if you feel like you're forcing it wrong, you're probably doing it right :) I removed the shield first then set the lens in one pin and half bent it while installing on the second pin and it went right in. Perfect fit!It works. I understand the principle, but when I first installed it and saw how very thin the air gap is between the pinlock liner and the face shield I wondered how it could ever be effective. But it is. No more foggy face shield on these recent chilly mornings.Edit: After a couple of weeks I noticed what some other reviewers have also noted: moisture trapped inside the insert near the bottom edge. Looking closer I saw that there wasn't a perfect seal along the bottom edge. I gave one of the pins a quarter turn, and this tightened the insert fully against the face shield all the way around. That ought to take care of the moisture problem. Loosen that tiny philips screw just a bit and use needle nose pliers to rotate the plastic "knob"; it turns pretty hard. This is on an HJC CL-17.At first I loved it. Bought in April 2020, used often since then. January 2021 noticed windshield fogging up and that the pin lock was sagging away from the windshield. Worked awesome till it started to sag, Now it’s useless because there is no seal anymore. Don’t feel like paying $30 annually to keep the fog away. Going to see what other options are out there now. I do take good care of my helmet so I know it’s not from neglectAll magic "potions" that claim to stop fogging suck for a very basic reason: They are all using chemistry to solve a physics problem. The one exception is the Clarity Defog product which I will elaborate on and link to shortly.If you are looking to keep your motorcycle helmet shield fog free, especially in weather south of 35 degrees (F), the only real choice is the Pinlock system. It uses air to create a barrier that inhibits fogging with as close to perfect results as you can get. The only downside of that is that there's a little added glare, but glare is a heck of a lot easier to see through than fog.For those of you that wear glasses, the good news is that out of all the magic anti-fog potions that suck, there is one and only one that doesn't suck nearly as much as the rest: I highly recommend the What a difference this made on cold mornings! Before I installed this, I would easily fog up my shield with a single exhale. That meant riding with the shield cracked open, but even then I would eventually have issues.After installing the pinlock shield, I get absolutely no fogging in my line of sight (quite a bit fogging on around the pinlock shield but none on it).The only downside I have is that in direct sunlight, the pinlock shield can show bits of light (not completely invisible), but this is minor and well worth the tradeoff.As you will know, after a while, Pinlock inserts get increasingly difficult to see through over the years and cannot be properly cleaned with soap and water per the instructions. Replacement is the only viable option.Well, this replacement fit my HJC CL-16 helmet just fine, but note that they did not include new pins with the new insert (which they used to), so hang onto your pins as you may need to reuse them.