I have 4 support devices. 1 monopod (chicken foot from varizoom), ultra lightweight CF, medium weight CF, and large CF.

Heads are

small lightweight ball head (this really isn't a "pro" level piece, but it is very light)
Monopod head which is pretty light but is bigger in total size - it has a pan swivel in the clamp.
Medium ball head from Sunway - pretty good most the time
Large Ball from Vanguard (biggest CF tripod from Vanguard) it is "OK" but really isn't at the RRS level, etc.
RSS PG LLR -"the beast"

The lightest set can carefully take on the 5dIII w/ the 150-600 but not unattended in a breeze - it is more of a motion smoother/load taking than anything else - not going to extend a shutter speed.

The mono pod is really quite substantial and I used it for the most recent fireworks - no breeze, highly attended and on an intervalometer

The medium CF tripod can hold all my gear - indeed I hang my back pack from the center hook and use straps to stabilize the load to increase the mass of the entire rig. I have hung 50 lbs from it with out a problem.

The big CF tripod is used when I have am trying to get that ultra stable platform. It is a 3 piece that w/o head gets to 70" or so.

The thing I would do all over again is flip locks vs. twist locks. I am much faster setting up the flip lock tripods - getting level, secure, etc.

My 2 pennies