They're alright. They are twice the size of the lead shot I want to be using, but haven't the initial $ to purchase. [it comes bulk-$25 for like, 20 lbs or something]
i use 4.0 and plastic pellets, it seems to work well, but if u can mix it w/ lead it works a lot better. If you're planning on selling bags it's worth the money for the lead shot, otherwise aquarium rock/bbs/plastic works good enough... just shortens the life.