Good. It took a few days to start kicking in. At first I thought that I wasn’t going to like the product very much as my sleep was getting a bit messed up and I wasn’t feeling any effects of the supplement on my muscles. By about day 5, my sleep was getting more consistent and when I would start my morning workout while drinking my pre-workout drink, I could feel the usual “Animal” pump start to kick in and my muscles would start to get that “full” powerful feeling that I have gotten used to from Animal’s other growth hormone stimulating products. I would still rate The M-Stack as my favourite Animal product however the PM supplement works as well! Packaging is the usual soothing black and red that we have come to love with quality ingredients contained inside that we have come to expect and receive from Animal!