Nice concept but too much latency between camera and phone (Sony A7SII / Samsung Note 10), but I heard it works well, when you pair your phone with Zhiyun Wireless Video Transmitter ($150). Personally, I would have liked an external monitor and a small grip mount. External 5" monitors aren't that different in weight these days from your smartphone, and let's face it, your phone's color and features don't come close to what a good field monitor can do, so for me it's a tough road to take, although it's great.