Things I liked:Made of lead. Useful for maximizing the weight of my son's pinewood derby car. Things I would have changed:I couldn't figure out why they were shooting so poorly until I measured them. Head diameter variation was a staggering 0.23mm! Typical head sizes were only 5.46mm, with a high of 5.59mm and a low of 5.36mm. To give it an approximate timeframe, my tins were purchased in December 2012. Brandishing them as "Match" pellets is borderline false advertising at worst and disingenuous at best. What others should know:Quality control with Gamo's pellets seems very hit or miss recently. We had good luck with the Gamo Rockets in .177 cal in my son's rifle. The heads are a consistent diameter. Also have read good things about the Red Fire pellets.