I've just watched this video on you tube. It shows the 'gimbal' action at 3 minutes.
View: https://m.youtube.com/watch?v=9GJQPJOKP8U
I can see how it's a gimbal action but my worry would be the weight of the lens and camera off to one side of the tripod, especially with a big heavy lens. This could potentially topple the tripod as the weight moves around the outside of the tripod legs during panning. A gimbal head keeps the weight centrally over the top of the tripod so there isn't this worry.
A while again I was looking for the perfect tripod head. I ended up with the uniqball as it's a compromise of a landscape and long lens head. The levelling function is great for landscapes. There is a slight movement in framing as you lock it but that's easy to compensate for when setting the composition/frame. As a 'gimbal' it works well. It can't stay at any angle unlocked but it can sit level unlocked. I've not found this a problem as I keep a hand on the camera if it's unlocked. It keeps the weight over the centre of the tripod like a gimbal head. It's a compromise as a gimbal but the advantage that it's good for landscapes and is much lighter too outweighs the disadvantages for me. I now only have this one head that I use for everything wildlife and landscapes. It's worth looking at the uniqball if you are looking at the arcatech ball head gimbal function.
What lenses are you thinking of using it with?