I have a dji phantom 4 pro v2.
It has 2 methods of follow, pick an object on the screen and it'll follow, or it will follow the controller. I've tried it at slow speed, and it seems to work perfectly. I believe it also has parameters then can be set, follow distance, altitude, and a few others. For having no previous flying experience, I can honestly tell you, it's super easy and confidence inspiring. It wasn't long before I found its max distance, about 4 miles if I remember correctly.
I believe it was around 1700 new, mine has never been crashed, still have the spare props, it's probably been used 12-15 times. If you decide it's the one you want, I'll sell mine. It's one of the coolest toys I've ever owned, but it never seen to find time to use it.