Things I liked: Pyramyd air's excellent service.
Things I would have changed: Breech seal, sights, trigger, rail, and wood.
What others should know: I have owned three gamo guns and all of the have had problems within 5 months of purchase. The breech seals on gamo guns are a big problem, they rip, crack, and fall out. Save yourself some money and go for a RWS or Beeman.
Things I liked: Light weight, Synthetic stock, power, and accuracy.
Things I would have changed: The Trigger pull is a bit hard so it is hard to get good groups.
What others should know: I got the .22 cal and it will take down a squirrels, chipmunks, raccoons, and rabbits easy. So far i have shot 1/2 groups at 20 yards and 1 inch groups at 30 yards.