cbowlsby wrote in post #15969862
With a 500mm lens you don't want a center column.
I'd extend this to all situations, wherever possible I use my Gitzo systematic without a center column - much more stable. The RRS and Gitzo systematic tripods both come without center columns. The RRS tripods are more expensive than the Gitzos but the Gitzo center columns are about twice the price of the RRS ones. Both manufacturers have a wide range of accessories for their tripods like leveling bases, center columns, etc. WRT pricing RRS are invariant - they never go on sale. Gitzo have had sales with big discounts for the last few years in December and January, I bought my 3-series Gitzo systematic for $540 in one.
Both brands are very good. Many think the RRS tripods are better than Gitzo, others are not so sure. It really doesn't make too much difference and often comes down to personal preference. RRS makes a small number of models and they use milled aircraft grade aluminum to manufacture the base and the other metal hardware. Their customer service has a stellar reputation. Gitzo has a very large product line with many models and sizes. They mostly use cast magnesium alloy for their hardware, it's lighter than aluminum but can fail in extreme environments if there's a defect in the casting. This can happen but it is rare. Their customer service is not so great.
Since you are 5' 6" you'll undoubtedly find a suitable size tripod in the Gitzo range without too much trouble. You need to figure out which series you need, Gitzo recommends 3 & 4 series systematics for a 400mm lens and 4 & 5 series for a 600mm lens so it looks like a 4-series is the sweet spot for a 500mm. I'm sure RRS would recommend their series 3 for a 500mm. You just need to find a model that with ballhead and camera on top is right for your height.