Things I liked: They are inexpensive. If they happen to shoot well in your airgun you're in luck.
Things I would have changed: Make them so they shoot well in a Tech Force airgun.
What others should know: We found that these pellets don't shoot accurately in a Tech Force 99 airgun. Three inch groups or worse at 30 yards, whereas the gun shoots under an inch with other pellets.
Things I liked: Adequate power and accuracy with the right pellet for efficient pest control.
Things I would have changed: Nothing. If you changed something, it would just be a different rifle.
What others should know: I thought other reviewers' comments about the weight of this rifle were overblown, but they aren't. This beast really is heavy. The heft makes it a little tough to hold steady when shooting offhand even for a burly adult, considerably more difficult than shooting my Mendoza RM600 offhand. But shot over a rest this thing is great. My teenaged son and I have both made many remarkable shots with it. Recently he decided to test its range and has been hitting soda cans filled with water at just over 100 yards using a 4X scope. Shots on pests at under 30-35 yards are automatic, and most of the time the animal is dead right there. The best pellets we've found for it so far are Gamo Match, which groups under an inch at 30 yards.