Installed it last summer, love it.
I never had the smell people bitched about. Mine never gets tacky. Had it in for more then a year, and I love it. One of the best interior improvements I've done so far.
It never cracks, its water resistant for crying out loud! Water just beads up! It will however leave a stain were the water sat which is easy to fix.
For it to get tacky you'd have to live someplace were it got over 100* or something but thats crazy its not going to melt.
It does fade, but I found if you really care about it just take some wet tire shine and WIPE IT DOWN, it will be slick as crap with it on.
Once its on, its pretty much there. I had one little spot peel off around the pedels area, but it came off with some paint I didnt get off which was a mistake on my part. You can remove it by using a scraper and a lot of acetone soaking. And it stains your skin, just don't be a dumbass, put some gloves on.