Nearly as good as the GoPro Hero 7 Black in features and video quality, but it's just $220 with a waterproof dive housing included. Its electronic image stabilization isn't quite as good as GoPro's HyperSmooth, but it's definitely better than nothing. You also get shooting options like 4K video at 60 fps (with image stabilization at 30 fps), slow-motion video at 1080p at 120 fps or 720p at 240 fps, time-lapse photos and videos, live streaming and raw photo capture. You don't get anything more than the camera, a battery, the housing and charging and external mic cables, but if your main concern is getting good photos and video for less than a GoPro, this is a safe bet. Read more about the Yi 4K Plus.
Which is the best GoPro?
You get many of the same shooting modes you'd find on a GoPro device, such as time-lapse photos and videos and slow motion footage at 1080p at 240 fps, and there's even a Drive mode so you can use it as a dash cam when plugged into your car, automatically turning on when you start your car and off when you stop it. It's not waterproof on its own, but a dive housing is included as well as several mounts, two batteries and a charger that simultaneously powers up both packs. It also has built-in Wi-Fi so you can connect to a smartphone and use an app to control the camera and transfer your shots for sharing.