That is one expensive pellet rifle! Do you have experience with PCP air rifles? I don't. I just bought a Gamo Whisper Fusion Mach 1. It is the 1st air rifle that I have had since childhood - many moons ago! It is plenty powerful but not as quite as I was hoping for and definitely not back yard friendly.
Yes. Had tree rats getting into the roof vent one time, and I didn't want to shoot at the roof with a 22 so I tried several spring air guns, but they were either too loud or not accurate so I tried the Benjamin. It's very accurate, and with the velocity adjustment, you can adjust it to get it quieter. I found that 800 to 850 fps was the perfect balance for quiet and still being able to take a squirrel at about 25 yards with .177.
If you don't want to spend the money, here is a chart of decibel rankings for some spring air guns. http://www.straightshooters.com/decibel-ranking-of-airguns.html I just could never get the accuracy level I wanted with the spring guns.