Mickey,
Tuning gimbals is the primary reason I changed from home builds to COTS products. Gimbals are often much to inconsistent in performance, and with retaining accurate tuning, to pour as much time and lost/delayed work into them as we have. For some reason putting a great hand held gimbal on a multirotor can instantly turn it into a turd without a clean end.
Arruntus,
Some of us have been attached to the H for months prior to the initial release. Some of us even paid full price well in advance to assure we would have it in our hands early to explore it. That experience is part of what's holding back an order. Some of what is happening now is a repeat of history. Delay, delay, delay, lack of info from the manufacturer, shortage of ops instructions and manual, etc. At least for the H there was a guy out of Hong Kong that was posting a continuous series of videos shot from the H that permitted potential buyers to see the camera and gimbal performance, wind capability, flight agility, and speed for themselves. To repeat some of what was experienced with the H release baffles me.
The 520 certainly has potential, although the aircraft itself is not a big deal. You can build one any size you want, and using the right FC, have more operational features and ability to make use of various cloud programs while maintaining extreme reliability than you can shake a stick at. It's how whatever is hanging under, in front of, or on top of it works that makes it worthwhile. I'm hoping this one hits the mark but the performance info for everything involved required to educate buyers should have been on the street before the delivery date. I understand holding things back to prevent a competitor from under cutting you but there's a lot of people that helped get the H to where it is that deserved a little better in information exchange. Personally, I can fly anything so how it flies is no biggie as long as a reasonable stability level is present. What the optics can do by themselves and in combination with programming is what will cut the cake.