I'm also a fan of both Gamin and PS Engineering audio panels and have installed loads over the last 20 years. However, I think you'll find that the surround-sound feature of the Garmin GMA350 when used with stereo headsets is particularly good - you really do hear air traffic from in front, your pax from behind you and the P2 from your right (I'm assuming standard spam-can in his case). Very bizarre when first experienced but really effective.