Some Gamos are OK, I don't think they compare with RWS even for the price difference.
What I was saying is when they Chronographed the Hunter Extreme it didn't come close to the velocity they claim for it, so the top RWS that are even cheaper and easier to cock, with better triggers would do at least as well as the Hunter Extreme in reality. (plus shooting those lightweight pellets in a spring piston gun is hard on the piston)
This link shows the Hunter is seriously overrated in velocity, even with the alloy it was well short of 1650fps
http://www.pyramydair.com/blog/2007/08/gamo-hunter-extreme-part-2-velocity.html
BTW the listed velocity for most air rifles is not from using alloy pellets. That is a Gamo thing and they are the ones that use them a lot. RWS and other companies do not list velocity with anything other than a light weight lead pellet. Even if Gamo does make it a common practice to list with alloy they still point out that it is with alloy and list the lead as well, other companies don't even bother with the alloy.