What I didn't have time to add in the video is a gimbel for the iPhone. The OSMO adds a lot--but getting mic attachment in there is tough with balance issues.
Also, I loved the Media Mod for Hero8, but need a new one for Hero9, since it's a different size!
I had a DJI gimbal for the iPhone but I gave it away. I just found it unwieldy and hard to aim well when a GoPro 8 on a stick worked so well.
