Things I liked:The .20 cal pellets work really well in my Eun Jin Sumatra 2500. The pellets are really long and they fit perfectly in the cylinder. There is no need to worry about the pellts moving in the cylider causing the cylinder to jam. The pellets penatrate very well.They performed extremly well in the hi power 2500, very nice groups at 25 yards. The price is very good for such a fine pellet. Things I would have changed:Nothing What others should know:The pellets will fit very snug, but I think that this is the best way to get a good accurate shot.