I purchased a .177 caliber Gamo "Varmint Hunter" model earlier this year to clean out an infestation of "long furry tailed rats" that had taken up residence in my attic. The Gamo came with an adequate scope and a laser. The air rifle was more than up to the task, and I dispatched about 15 of the critters in my back yard (at the bird feeders) until we could no longer hear evidence of their continued residence in the house.
My house is in a subdivision where the houses are set very close together. The standard Gamo will shoot a standard lead pellet at 1,000 FPS, and will achieve 1,200 FPS with the "special" (copper?) coated pellets. The muzzle noise on firing the standard 1,000 FPS lead pellets was surpisingly loud, to the point where I had to be a bit careful when I was "hunting" in the back yard. Some neighbors may not have appreciated what I was doing. Also Texas has a hunting season for these long furry tailed rats, and this action wasn't in that season.
If I had to do it all over agin, I would have spent a bit more money on the Gamo "Whisper Series", these have something of a diffuser/silencer at the end of the barrel, and supposedly dampen the muzzle noise quite a bit.
I am impressed with the quality of the GAMO product, and it is an accurate air rifle. I would recommend it to anyone.