the weather's finally warmed up enough to get out on the motorbike and use the Mavic as I originally intended: to accompany bike trips away.
The portability is indeed really good. I have the bag that came with the drone, and that fits the Mavic, two batteries and a case with my ND filters in quite easily. I carried the controller in a separate hard case. I'm pretty polished now a few months into ownership, and it is pretty much a 90 second job to get in the air from the point you get off the bike.
My mate actually did a far better job producing his video - he's just better at it than me:
I've stopped using 4K recording for now - the general consensus appears to be that 2.7K is the sweet spot for maintaining good quality with high resolution. The wide open spaces in Wales were really good to get experience using the lazy cinema mode, although I do still need to dampen down the gimbal sensitivity to create a smoother effect.
Overall, I think the Mavic is capable of doing what I'd hoped it could in my hands. It really doesn't take up much space and is so simple to use. Now I'm getting in to it I'd really love to see the step up in quality of a Phantom 4 Pro, but I'm still learning to fly and film and couldn't yet take advantage of what it could do. The portability of the Mavic is still the key differentiator for me.