I've had the Carbon Fiber Giottos for 2 years and have had no problems with it. It requires some adjustment occasionally, but overall a nice, lightweight tripod, plenty sturdy. It's very versatile too, and I have to say, well built. I use a Kirk Ballhead (the bigger one) and a D2H / D2X and haven't had any problems.
Of the 10 tripods in our studio, ( Bogen, Majestic, Gitzo, Hercules and others), this one gets loaded for outdoors the most. I'd say the Giottos is a good all around choice.
Thanks Mark, that is exactly the kind of use to which I intend to put my tripod, versatile outdoor photography.