虛空活塞

The triple-cup suction is the real deal—it holds firm even at the highest dial setting, no slipping mid-session. Swapping between the six attachments takes seconds, and the stealth mode genuinely lives up to the <45dB promise, which my roommate definitely appreciates.

I was a bit skeptical about the analog speed dial, but it actually gives you fine control that digital buttons can't match. The attachments swap easily enough, though I wish the storage case was included for them.