I bought a set up for Christmas mainly to use with my Tachihara. Unfortunately I haven't had the time to really use it yet. First impression though is good. Set up in the house with the Tachihara on it, it seems like it should do the job, especially at just over 4 lbs. total weight. Beats carrying the 8 lb Bogen around. I got the middle size, rated at 17.5 lbs. If you get their ball head, get the largest one. As far as quality, it all depends one what you are putting on it. But for a 3.5-4 lbs field camera, even the medium head seems Ok.
Brian - west of the Sandias