I do. I have the Sirui M3004 (aluminum), which has now been replaced with the M3004X. The 3204 is the carbon version.
I like it because it is high (without center column raised), and still folds down to a little more than 20''. For me it is "good enough stuff" if you don't want to spend more money on the really right stuff or Gitzos. It seemed to be the only viable option for me that is tall enough, folds to a compact size, and has decent quality.
I also went with their ballhead, and again, cannot complain (but also cannot compare to any of the other ball heads out there).