Our verdict of the Yi Smartphone Gimbal:Makes silky smooth smartphone video accessible to all, but the offering is a bit barebones with no case included. If you can find it on sale for under $100, it's a good entry point, but spend a little more and there are more feature packed devices on offer.710The quality of smartphone videography has exploded in recent years, with the latest handsets able to record 4K video, in HDR or 60 frames per second.