My thinking is, a quality tripod deserves a quality head, and a quality head invariably means an expensive head
I think this is generally the case. Excellent design and very high quality construction costs money. The RRS and Markins ballheads get good grades for build quality and fit/finish as well as outstanding performance. My Z1 is beautifully built on top of its usability and amazing load specs. I have the expectation that my Z1 will last for 10-15 years (earlier A-S ballheads have) and so the higher initial cost is actually lower long-term. My 42 year-old Leica M2 is still going strong...
The level lock really does and the ball is rock solid when locking/locked; it doesn't swoop/droop like the Manfrottos have a tendency to.

