I used the Gitzo until around 2 years ago when i changed over to RRS, One of my better decisions, and I must admit I did that based on reading CR and in particular Neuro's comments.
Currently I use the following RRS gear, all of it works superbly with the 1Dx + 600 or the 1Dx 200-400.
TVC-34L, to this I set the TA-3-LC-HK Levelling base (I have the TA-2-LC Levelling base when I want get totally low to the ground), On this I mostly use the RRS BH-55 and the PG-02-FG and in particular find the PG-02 an excellent piece of gear, I also use the Stainless Steel TA-3-FS Feet for the Tripod when I'm using the system on Hard Ground.
To attach the Ball Head & Gimbal Head I use RRS Dovetail plates, on my Lenses I use RRS Replacement feet and L plates on the 1Dx Bodies and 5DMK III.
After carrying this gear from Antarctica, Arctic to Africa I haven't had a single issue with this gear, very stable, especially I like the hook arrangement when Imaging in high winds, snow etc, and the gear is extremely well engineered, being an engineer myself I appreciate how the Guys at RRS just produce exceptionally well made equipment.