I bought this to use with a Canon 5D Mk II as it has no stabilisation at all, with a Mk1 24-70 lens. Also, with no autofocus for video, I needed a way to smoothly pull focus, so also got the follow focus motor for this.
For it's size, this thing handles it brilliantly! My rig is probably bordering 2kg (1.8kg camera and lens, plus focus motor). I will say, for a heavy lens, don't use the extension plate, as I spent about 45mins fretting I'd bought a too small gimbal as I couldn't balance it! But after removing that and mounting straight to the quick release plate, it was perfectly fine (though with about 3-4mm space to the lens). I also bought a SmallRig handle specifically for the Weebill-S for underslung carrying, as it has a kind of lip that stops your hand sliding off the end unlike Zhiyun's. Also has more mounting points, and a cold shoe on top (would highly recommend!).
Lastly, the price is brilliant! This was sold out in most places, and someones wanted to sell this second hand to me for over £300!! So finding it cheaper than some second hand prices was an absolute dream!