I'll say what I dislike about it 1st, The cost! I would use this product a great deal more if it was affordable in the use of other projects. At present I am doing a relatively small tile job and using this as the tile adhesive so that it's not necessary to use a trowel as my hands cannot handle the stess and strain as I've had 3 surgeries on them. I will likely hire someone to apply the grout. This is an outstanding product that I have used many times to my satisfaction and as I mentioned previously about the price, it is the only issue I could possibly share anything other than extremely positive comments about. I attented a presentation on this product when it was 1st released and asked one of the technical representatives if it would work well on large, thick, and heavy marble, stone, granite, or porcelain vertical applications and he assured me that the adhesion was strong enough to set without any aids to hold the tiles and place once it was laid. In addition to adhesion properties I was concerned about any bleeding or stain that could take place through thin or opaque tiles. He assured me there's no bleeding or staining that would happen however, the product is gray and if a tile allows enough visibility though it, you could see the gray color of the adhesive. Of course this is true of any see through tile. Whatever the color of the adhesive, it will be seen, that's why most people choose white but in some applications you might actually want to see gray.