I didn't realize how dingy and dull my slate was until a friend recommended I consider getting it cleaned and resealed. I was concerned there wouldn't be a significant difference, but I was pleasantly surprised once the job was done! The dirt embedded in the slate is gone, the cracked grout was repaired and the grout lines were restored to their original color. I ended up going with 2 coats of the 300 sealer and it's a night & day difference. I'm very happy with the services provided. David was very thorough & informative when explaining their services/processes/prices and he did a great job completing the services. Efrain was very responsive when scheduling the appointment. It was well worth the money spent! My only regret is that I didn't take a before picture for comparison.