I opened the boxes immediately after arrival and was impressed with the heft of the tiles.  These are substantial and well-made.  I have not yet found any tiles missing pebbles; all are affixed and in place.  The tiles appear to be very durable and I think will hold up for a long time to shower traffic.  This product fits the description in color (variations in gray/blue, off-whites and other neutrals with occasional odd color) and in my opinion is of very high quality.  It's worth the price.