It's our industry standard here. I've worked with the Fisher 10 and 11 in a Dolly Grip capacity.
Pros:
-Solid as a rock
-Jib arm is smooth, and has floor to ~5 foot reach without any additional bits
-configurable with the full kit of boards and risers
-Wheels are great on concrete
-Standard steering, crab steering and round steering, and switching between is easy
-easily holds an operator and AC, and can rise the jib arm even with one person standing on the arm.
-With a competent Dolly Grip, pretty much any move can be made smoothly.
Cons:
-Heavy, thought the 11 is significantly lighter than the 10, and you'll need a truck to transport it.
-The 10 is a tight fit for doorways. 11 is several inches shorter in width
-Uses proprietary Fisher track, so in Canada we have to use speed wheels to adapt to our track.
Frankly, since I used it, any other dolly just is not the same. If you have the means to use it, I would.