Thanks Mongo:
The R1C1 is the best setup for the type of macro I do, butterflies, frogs, etc. The weight is reasonable, the ability to move the heads around on the ring is incredibly handy when shooting around foliage, where you want to not cast a deep shadow under the subject, just rotate a head around to the bottom to fill in the shadows. Being able to adjust the balance between the two flashes, set exposure comp on the SU800 commander, all good.
I had used a variety of brackets, cords, flash units in past, but this is the best setup for what I do.
I think that two heads is enough for most use, unless you want to have one unit off camera on the little shoe mount, and position it behind the subject to light up the background. Can be handy, but that often isn't possible where I shoot.
Happy to answer anymore specific questions.
Cheers
Randy