My rating of the ball head after testing with Canon EOS40D / EOS600D and 17-55 / 2.8 IS USM and Canon EF 70-200 / 4 L IS USM + Stativschelle:
(Canon EOS40D / EOS600D with 70-200 / 4L IS USM + Stativschelle approximately 2000g / 1700g)
++ Workmanship
++ Stability (also depends on the used housing / lens combination from)
+ Panoramic window
+ Friction
+ Parking Spanner well shaped and stable
o heavier ball rolling at minmaler friction (eg at Cullmann Magnesite significantly lighter) can also be better for heavier cameras (eg pleasant at EOS 40D)
o great height of the head (12.5 cm), characterized, however, higher working height
Conclusion: can make a very good piece of technology, the very good service. The ball head is definitely worth a recommendation for medium SLR systems with more than 2.0kg weight.