Things I liked: Accurate and cheap. They work well in everything I've tried them in from my AA Pro-Elite to my tuned Crosman 2250. Not quite as consistent as the box Premiers, but hard to beat for sitting there sending lead down range.
Things I would have changed: Not much to change.
What others should know: I've only shot them through springers or CO2. Don't know how they'll shoot through a high power PCP.