Things I liked:I've owned this gun for about a year, I upgraded from an old 10 pump 650 FPS BB gun that I owned for a long time, and man, it was a big jump. I used my old gun mostly for hunting (squirrels, birds, groundhogs, etc.), so when I switched to this thing I really noticed the difference. First of all, it's insanely powerful. Shooting something like a crow at ranges where my old gun would do no damage or just absolutely miss, this gun goes straight through the target (with the right pellets). Larger things like groundhogs that use to freely eat up my garden stay away now that I have this gun. Yeah, this gun is a beast. Secondly, the accuracy of this gun is also awesome. The grouping is very close even at long ranges, I never measured exactly how much though. Also, it's sorta heavy but it feels solid when you hold it, it's got nice rubber padding so it doesn't hurt your shoulder when you shoot, and it looks very cool. Things I would have changed:The scope. I'm still using this scope but it has some problems. Because this gun has a lot of recoil, the scope creeps forward. Every shot it gets a little more off target, and you have to adjust it often. Other then that, the scope is excellent. The trigger also has some problems. A couple times I have sat outside and spent a few hours and about 80 or so pellets shooting at some targets. After a lot of shooting, the trigger needs to be pulled back very far to fire, and sometimes it doesn't fire at all. Keep in mind this only happened twice to me, after at least 60 or 70 pellets in a short amount of time. I don't know if my gun is just defective, or if this is a mechanism telling you that you're shooting it too much, but the next day after it happens it's working perfectly again. Maybe the gun just gets tired and wants a nap :). What others should know:This gun works great with certain pellets, but others have terrible accuracy. Good ones (out of the ones I have tested): Gamo Hunter; most match pellets, every brand I tested worked great; Crossman Field Point pellets, they seem very generic, but were some of the best performing pellets for me, high accuracy and penetration power; and of course the Gamo Raptor PBA ammo. (Note: the Raptor PBA pellets break the sound barrier in this gun, so when you shoot these it will make a supersonic crack that is really, really loud, and may get the cops called on you if you shoot these in your back yard. Do your neighbors a favor and only use these in the woods away from civilization.) Pellets to avoid: Gamo Magnum and Gamo Master Point. Both of these pellets were great in my old gun, but in the Viper they get 6+ inch groups where others get 1 or less. Don't know why, but they are just horrible in this gun. All in all, this is a great gun. If you are looking for a high quality hunting or plinking gun, this is an option you should really look into. Hope this review helps you make your decision.
Things I liked:Don't know what kind of pellet will work best in your gun? Then buy this sampler pack! This contains Gamo's main line of pellets, Hunter, Magnum, Match and Master Point. Find out what ones work best and buy more of them. Things I would have changed:Nothing, really. What others should know:Good value, I highly recommend it.