In my opinion, life would be easier to pick another product. It’s not a bad product, but the potential for a headache isn’t worth the advertised benefit.
While I have used a lot of Tec products over the years and like them, I won’t use this product. This isn’t a wonder product. Any standard cementitious grout can be very easily sealed with a foam brush and a few minutes time. The important things to remember are to buy a decent sealer, apply the sealer to the joint (maybe 25 sq/ft at a time) and allow to dwell for the specified time (usually about 5 minutes), and don’t let the sealer dry before you polish the wet joints 100% dry with a white rag.
A grout that will make your job better is to use one that will dry to its advertised color (splotchy and lighter-than-expected grout color are very common problems). I suggest Laticrete’s Permacolor or Custom Building Product’s Prism. Both are cementitious grouts, are easy to use, and dry to their advertised color.