I've tried LOTS of different brands and flavors of protein powder, and nothing compares to Persist ISO! The powder dissolves quickly in water or milk, and I never find myself drinking chunks of undissolved powder or feeling any grittiness. Plus, the flavors are AMAZING! The coffee flavor was a little strong for my taste, and I ended up adding some flavored coffee creamer to that one. The others, however, are fantastic on their own. It's like drinking melted ice cream!