Works great, leaves the leather looking like the original finish. Does not change the feel of the leather.

I am impressed with the Gtechniq L1 leather guard. It provides water resistant, uv, antibacterial, and anti-abrasion properties to your seats for up to 6 months (though I apply every 2-3 months). The application is fairly easy, though you still have to apply a little elbow grease. Once applied your leather feels softer, looks very natural/matte, and there is no unpleasant odor. It is important to note 4 things here though. One, this is not a cleaner. L1 is a guard so this is something you do after you clean your seats. Two, even if your seats look clean be sure to clean your seats before applying the L1 guard. You will thank yourself as it goes on a lot easier and streak free. Three, don't let it set for 5-10 minutes. I found when I let it set and dry that it can be smudgy. Apply a healthy portion of L1 and once the wet look starts to fade buff the guard away with a microfiber buff towel. Finally, apply the L1 guard in sections. I have found it is better when I do the bottom portion seat, and upper seat separately as opposed to all at once. Great product though that I would recommend.

Easy to apply and buff off any excess. Leaves a matte finish and leather feels like new.

Unsure on longevity or water repellency properties, but this is not a "ceramic" coating for leather, just a durability booster product. Worth it especially for high wear areas like side bolsters, steering wheels and headrests, armrests or center consoles.