Several slabs were broken on arrival. The slabs mark very easily and cement stains cannot be cleaned with brick acid as the acid stains the slabs permanently. The slabs are also prone to fading (which I knew about before I ordered), but was/am willing to live with as I was slabbing a large area and was trying to keep costs down. Bottom line is.. You get what you pay for. If you want a permanently black slab without using a sealer, seek an alternative, but be prepared to pay more.