Ok, so the price will have you thinking this is no pro kit, but don't be fooled. Although not as good as say X-Rite kit, it works very well, and you can't argue with the price. This is an essential piece of kit for anyone wanting to control their shooting environment and control the WB - especially in post processing. The grey has given me excellent results with my white balance, a very natural colour that was better than the presets in my software (Capture One) and the white and black cards give that little bit of extra control. Someone else mentioned the sticker and that it was hard to take off - that's because you're not supposed to according to the instructions - it's there as a focusing tool if you need it.