On a pumper, yes that scope is fine. On a spring gun, that depends on the gun.
Gamos don't have a real good reputation, mostly due to the fact that the factory won't provide support for their guns. If it breaks, you can't fix it, you need to send it back to them for repairs. And if you've opened it up, or even taken the action out of the stock to lube it, you've voided the warranty, and it'll cost you $$$ to fix it. Lots of complaints about triggers and spring vibration too.
How much you looking to spend? For just a bit more than the price of the 440 (mid $200 range with scope), you can get a real nice Webley (Stingray or Xocet, high $200-mid $300), RWS (92, 93, 94, or Diana 34, somewhere around $200) or BSA (Supersport or Lightning $300-350), or even a Beeman R-9 (a bit over $300). These prices are for new guns, nice used ones are easy to get for much less. All of them have excellent reputations, and come highly recommended by the guys that own them.