This is absolutely an awesome product, i use both depending on what time of day and when my workout is. Typically i mix the 2 for greater protein to fat ratios, however if i skip a meal or know i will need calories to burn i will just take the True-Mass. I have tried many different supplements over the years, BSN has by far the best tasting and best quality protein on the market. Ive gotten leaner and more defined while still building muscle and maintaining my weight (165#) Do yourself a favor BUY IT!