I rarely post negative comments about products, but in this case, I feel obligated to share our poor Silestone experience with Gardenweb.
After reading and hearing how Silestone is both durable and stain-resistant, over a year ago we had $3,500 of Silestone countertops installed as part of our kitchen remodel. The sales guy talked extensively about how the only thing that would scratch it was diamond, saphire and other pieces of Silestone and that it was extremely hard and chip and stain resistant. Unfortunately, it has not lived up to its marketing hype.
Our Silestone countertops have chipped in several places - both on edges and in the middle of the surface. And there are a couple of scratches and a stain to the surface too. The first chip occured when the bottom of a glass bottle lightly tapped the leading edge of the countertop while unpacking groceries. The impact was very light - no concern about the bottle breaking - but a dime-size chip of Silestone broke off. The installer said this was not covered under warranty and charged us $75 per hour for the repair. While the repair guy was waiting for the epoxy patch to cure, he commented that they do not recommend Silestone for people who use their kitchen regularly and expecially not for households with children. He also recommended we use 600 grit sandpaper to sand out scratches, adding that the quartz material used in Silestone is very hard, but that the bonding material will scratch.
The stain was caused by blueberry juice which leaked from a bag of frozen blueberries. It has faded over time and we're fortunate that our countertops are a dark brown color.
We now have a few new chips and scratches and are living with them.
We previously had granite countertops and did not have any chipping or scratching problems. Our Silestone countertops look nice, but we now lay down dishcloths or Silpat (silicone) mats before setting anything glass or metal on them.