I've rented the Miller head and like it, though it's about 35% to 100% more in cost that the equivalent manfrotto.
Film guys don't like manfrotto, though I've had great luck with them, the only issue is they tend to wear out faster, though our situation is unique in that i have multiple sticks in our multiple locations so costs becomes a factor.
I will echo what Morgan says in going with standard video sticks the three leg, to two to one with a spreader. Set up on this style of sticks is 4 times as fast and single leg sticks and the spreader makes one person setup easier, especially with heavy cameras.
Easy setup always produces a better look as during a long day, a unwieldy tripod just wears you down and regardless of intent your brain's desire to protect you takes over and you move around less and less.
I know one DP that uses Jib Arms just for this reason and one of the most respect TV DP's and directors I know shoots all open area exteriors with a shotmaker because of speed. http://www.shotmaker.com/
Obviously a shotmaker doesn't fit well in a room, but if you've seen a tight crew work one, you'd be amazed at how fast setup is.
Anyway, sorry to go off topic.
The only downside of a 3,2,1, video tripod is it screams video which means you set it up on the street and it draws attention, or if on location your fees go up dramatically as there is no under the radar .
The biggest thing that bugs me about Satchler and Manfrotto is the fact that they change models so quickly. I'll find a great head, then try to buy another and it's been replaced and every head is like a different camera, all the controls are just enough different to not make it intuitive.
I have one large manfrotto head that I use for the PL mount R1 and I can set and level that thing almost as fast as handholding, but they don't make it anymore and it drives me crazy. (which is a short trip).