Very impressed!
Our black kitchen sink looked white with all the hard water staining before using this product.  This spray really worked!  The trick for us was to spray the desired area and to let it sit for a few hours, not 1-2 minutes, like the directions say.  We had a severe case of hard water stain.  For other areas, we let it sit for about 5-10 minutes.  We also cleaned our bathroom glass shower doors and our dishrack.  Everything came out looking very nice!!  The smell was definitely tolerable.
Rating: 5 stars