Gitzo 6X for a light weight tripod?

Hope to get some advice please.

I've been carrying the Manfrotto 055A (2.2kg) tripod around for 3
years and am really wanting to cut down on the weight. I now live in
Vancouver, BC and there's plenty off hills, lakes etc to take 360
shots of and have been looking at the Gitzo 6X Mountaineer series 0.
and 1. The monopod is out as I'm using exposure bracketing more than
ever now.

Has anyone had any experience with the light weight tripods? What
equipment they will hold? I'm hoping for something weighing 1.2kg area
or less if possible.

I'll have a Manfrotto ball head, Nodal Ninja 3, Nikon D80 (D300 next
year) with 10.5mm sat on it and sometimes the 18-135mm Lens.

Look forward to any replies.

All the best,

Andrew