We took our brand new Feiyu Tech Summon 3-axis handheld Gimbal for an outdoor sound test today. Outdoor sound recording is difficult at the best of times, and without external high-grade microphones, often sound quality is poor, muffled or clouded with noise. The Summon records audible, usable sound outdoor. Definetly useful but not professional grade.
The Summon's motors are completely silent and I could only feel vibrations when the gimbal was directly horizontal, so vibration sound isn't an issue.
Here's our sample of how the Summon in action outdoors.