I've used Makita, Milwaukee, and Vector. I'll break it down like this:
Milwaukee
Pros - Very stout motor, Durability (Thing's built like a tank)
Cons - Too bad it weighs almost as much as a tank, Expensive
Makita 9227c
Pros - Light weight, Easy to control, Settings dial, put together very well, wide speed range (600 rpm - 3000 rpm)
Cons - No information on the notches between the numbers on the speed dial.
Vector Polisher
Pros - Light weight, easy to use, price
Cons - Can't think of any at the moment