We bought a new shower door and chose to have Enduroshield applied before installation - this was our introduction to the product. I loved the result and so bought the Tile and Grout pack online and applied it myself. I was happily surprised at how well the product worked - and is still working. Water and all the hard minerals it contains (lots in our area of the USA) just slides off the wall. The shower had just been remodeled and all the tile and grout was new, so I did not think I would see much effect of the Enduroshield I applied. But I was so impressed at how well water just beaded up after the application that I kept throwing water on the tile just to watch the effect.
It was not difficult to apply but I was very careful to follow the instructions exactly as written. It seems other customers have not been happy with the product but I have been very pleased with our results so far. I do try to maintain it with vinegar/water cleansing periodically and squeegie the walls/door after most showers. I absolutely recommend this product.