I was a backer of the Zerotech Dobby when the launched it for crowdfunding in China (long story) It’s a pretty advanced piece of kit running a Snapdragon 800 series chipset. I’ve not used mine in a while but the last update I had brought with it face tracking and object tracking.
Object tracking worked well and allows you to follow someone at low-ish speed. Tested with my son cycling up and down the road. It wouldn’t work on the trails as it can’t keep up.
The camera on it is fixed so you have to get it where you want it (think there are 3 positions) before flying. Takes good photos, nothing stellar, but good enough.
Battery life is only about 10 minutes (if that). I’ll have to dig mine out again and see what new features it’s been given.