We have had this sink for about a month and so far, so good. It is beautiful and the included metal sink mat keeps anything from scratching or damaging the bottom, although I doubt it would be easy to damage or scratch.  I've tossed a knife in a few times and it didn't affect the walls of the sink at all! The black finish starts to look a bit dry and dusty after several soap cleanings but the luster oil completely restores it.  We love this sink so much!