Based on Thom Hogan's test of tripods, I bought a Robus RC-5570 tripod two months ago, and got a chance to really try it out last week on the Oregon coast. I've been using an RRS TVC 24 but there are times it's overwhelmed in windy conditions causing vibration and therefore soft shots. And there are times when need a bit more height.
The Robus acquitted itself well--no strong winds but when photographing in shallow water on the beach shooting sea stacks, small waves that I know would have caused vibration on the RRS didn't affect the Robus, so the sea stacks were sharp during long exposures.
The Robus's max height (70") is so tall that I only needed to extend the top and middle leg sections (the bottom leg section remained fully retracted) to be able to bring the camera view finder to eye level (I'm 5'9", and there's a leveling base on the tripod). The tripod is extremely sturdy and stable and it probably could handle any long heavy glass you put on it. But that sturdiness means it's heavy (about 5.5lbs), folded up it's really long (over 25") and the apex is huge, much bigger than my RRS, so it's not exactly travel friendly. I'll need to use my biggest duffel when I fly with it (I always carry my tripod in a checked bag). There are many situations where the Robus would be impractical (ex. I'd never strap it to my camera backpack if I have to do any hiking), which is why I'll always keep my RRS tripod.
EDIT: Ron, I was composing this post and didn't see your comment about weight or cost. Given those two things, I would also point you toward a series 3 or 4 RRS tripod. The Robus is nice, and less than $600, but after owning and using an RRS tripod, and from experience with their great service, RRS is hard to beat.