Finally, the GT1 Tomahawk Gimbal just arrived, 13 days after the order placed from BH Photo/Video....
And I have to say it's love at first sight!
It's beautifully machined with anodized aluminum alloy, and it's beautiful and stylish to look at. It's perfect size for either tripod or, in my case, monopod for the most part.
Prior to receiving this, I purchased a Sirui L-20S Tilt Head with Level Panning Base with the idea of comparing both for my birding purpose and keeping the one that I prefer and sending back the other. But after trying out both, I decided to keep them both because they turn out to complement one another although either alone would suffice for birding with my Canon 5DIII and Sigma 150-600 C.
The Tomahawk can be used either with the ball head or without. However, without, it can only mounted to 1/4-20. Instead of converting my Gitzo mounting plate thread, I just mounted to the existing Sirui L-20S in order to also use its buttery smooth panning base. The obvious advantage of mounting on a monopod directly without either a ball or tilt head is less overall weight, but in the case of mounting the Tomahawk onto L-20S, the advantage of being able to pan is really attractive for me in spite of added weight. But, either way, I like that I have an option. Obviously, one doesn't need a panning level base on a monopod, but once you've tried the smooth panning on monopod, you'll probably won't go back.
Another important feature that attracted me to Tomahawk is its versatile mounting that doesn't restrict the angle of my lens. My 5DIII and Sigma 150-600 gets to vertical position, from pointing up to pointing down.
I'll take some photos of the set up in coming days and post them here.