Build Quality: The gimbal is very well built and sturdy. I cannot test the longevity of the moving parts until I've used this for at least a year. My 2 main Olympus Zuiko MFT lenses have the same weight so I don't need to keep re-balancing and adjusting. The grips feel really good and the sling mode feels natural to hold. I was very skeptic before about sling mode but it actually works.
Footprint: The Weebill is almost half the weight of Ronin-S with a portable size meant for travel. This is the perfect run and gun gimbal for my use case, which involves event coverage and annual travels. People will look at you holding your cute gimbal but it's not a tank like the other stabilizers. Despite its small size, Zhiyun managed to put a screen with the info you really need and you can even change motor settings which is a plus. There are multiple buttons, which I love but am afraid to click accidentally so I find myself always rechecking my Control Mode using the screen. As for the wheel, it feels alright but not as good as my drone's joysticks. I struggle a bit with precision on diagonal joystick movements.
Balancing: Whoever thought of the axis locks is a genius! It makes balancing the gimbal less clunky. Youtuber Chungda explained balancing pretty well on his video so I recommend giving it a watch. There are some reviews online of people with longer and heavier lenses, where balance may become an issue and in turn stabilization suffers. My lenses are 410g and I've had no problems at all. I'm still waiting for my Blackmagic Pocket 4K, which a Korean Youtuber managed to balance using some counterweights. Right now, I've been using my wife's Olympus EPL camera and it's been a breeze.
Stabilization: I made a video of available Control Modes for the Weebill. I suggest learning these inside and out since certain cinematic moves can only be done on a certain control mode. You don't want to be fiddling with your gimbal and end up missing a good shot. For modes like POV, manipulating the gimbal where it hits over 45 degrees cause vibrations. If you're familiar with the limitations of each control mode, you shouldn't have any problems. Some light gimbals will have bobbing problems but since my camera and lens aren't on the lighter end it's not bad at all.
ZY Play App: I've never been a fan of using a phone as a monitor, even though that's what I always do when filming with my drone. I don't think I'll ever use image transmission and I doubt the ZY app would have Blackmagic camera support anyways. With the app, the timelapse would be my most desireable feature. I also like how you can change gimbal settings and update firmware through your phone. Some early buyers already have complaints of lag and delay in image transmission so hopefully a software fix is in the works.
Price - The Weebill is the same price as the Moza Air 2 and cheaper by $100 than the Ronin-S. For the features and footprint, I'd say this is a very good deal. I honestly had the Ronin on my cart since I have quite a few credits from the store. Then, the Air 2 got announced with some tempting bonuses and I put that in my cart instead. 3 days after, Zhiyun announced the Weebill and after doing some Excel comparison spreadsheets, I've come to the conclusion that the Weebill has the most value of the three. It became even more apparent when I got my hands on it.
If you have read up to this point, thank you for your time!