Ryobi Whisper Series: are the tools actually quiet, or just marketing?

Ryobi makes tons of excellent tools for inside and outside the home, for outdoor activities, and more. And if you're sick of yard work tools loud enough to double as a soundtrack, Ryobi has plenty of solutions. Surely you've wandered Home Depot aisles looking at mowers, blowers, or trimmers and seen the "Whisper Series," but is it any good?