I was looking for a product I could use to resurface my chimney.  After looking into cultured stone and other lightweight stone manufactures, I decided to go with GenStone.  Mostly because they had corner pieces in addition to the side panels and given I was surfacing a chimney, there would be as much corner work as anything else.  It took two days to complete the project (lots of custom cuts) but the end result looked even better than I was expecting.  Cutting the material is incredibly easy.  All you need is a hand saw and maybe a keyhole saw for certain smaller cuts.  No power tools required.