I've now grouted five different major tile projects, and am not impressed with the performance of polyblend grout. In both natural gray and sandstone, the color was very uneven in the finished project. It looked fine until the grout was thoroughly dry, but then some spots still looked dark (like they were still wet), and other spots were lighter. The problem has persisted for 10 years in one bathroom and four weeks (so far) in another. It's not my technique, because I didn't have the same problem with the Laticrete brand.