Chalk is chalk. This one works great!
What else can I say? Chalk is chalk. This one happens to work great! I like its small-chunked, ground-up consistency because I don't have to spend time breaking up big chunks and it dries out my hands without giving them that squeaky/slippery feeling that can happen with fine powder chalks. I don't use much chalk at the gym but I use it often climbing outdoors, and this one's my favorite. I've tried big, cheap chalk blocks and Metolius chalk and my personal preference is for the BD White Gold.
By the way, the 56g size comes as a solid block whereas the 100g, 200g and 300g sizes come loosely ground in a bag or little plastic tub. It's confusing the way BC presents it above in the picture so I thought it'd be helpful to clarify.