Good luck! Please post a review soon.
Specifically:
how is the wifi connection?
Set-up time?
How much responsive is the app?
Should you leave the phone attached to the gimbal the whole time?
What you show below is the OSMO with X5 Pro. X5 pro records to SSD, so the block you see is where the SSD resides and at the same time you can insert a standard highspeed micro SD card which the X5 can write to simultaneously. X5 Pro records 4:2:2 natively. so far I don't think any compact video camera can do that yet. This combi, you are looking at a $8K setup.