If anyone is considering installing new tile or taking out the old grout and putting new in, I had a bathroom tub surround done with Laticrete Spectralok. It is non-sanded, NEVER molds or mildews and looks fantastic. It's pricey but no further work as far as keeping itliiking nice. If anyone wants a pic, please PM me with your personal email address. NO I have no affiliation with any of these products. For my home office, I installed the tile myself and used Fusion Pro. It was a brand new product that was supposed to rival LS. It comes in a bucket premixed and super easy to to work with. the floor furned out nicely. Yesterday after reading these posts, it reminded me that I had a small area still needing to be completed so I got out the Fusion & finished up. It looks really good.
My kitchen and dining room grout look bad, so in my Spring cleaning frenzy I'm going to work on it.