Things I liked:Sampler Pack are a very good concept. They are a relatively inexpensive way to test various pellets and not have a few thousand sitting around, that you can't use, afterwards. Things I would have changed:Rather than having only three pellets with different head sizes, I would rather see a broader range of pellets of one size. My gun doesn't seem to be sensitive to a .01mm head size change. What others should know:For whatever reason, non of these pellets grouped well in my AA S400 MPR FT.