Very nice! It's great to have some audio from across a field rather than from onboard (or nearly so) -- I'm thinking about how to adjust a sound system in a model, and it's clear from the onboard load-test videos that the sound is different just from one end of the engine to the other. And, even though it's "just" iPhone quality, that's quite a few steps up from the camcorder and VCR quality we used to have!