[gundog]

Much quieter than my Gamo Whisper in .177.

Frangible, too.

[papertyger]

The gamo whisper is a break-barrel springer (noisy), and breaks the sound barrier (even more noise). A full power .22 firing a 40 grain round at 1200 ft/sec develops about 127 ft-lbs of energy. Everything you can do to quiet that down will detract from the energy it delivers on target.

By comparison, a suppressed .25 firing a 34 grain pellet at about 1050 ft/sec (below the speed of sound, thus no sonic boom) delivers about 90 ft-lbs of energy and make less noise than striking a match.

[papertyger]

Following the ballistics chart attached to the link you posted, the CBee only generates 40 ft-lbs of energy; less than half of the setup I described, and with a smaller cross section.