Well, I made up my mind (finally). Last week I went with the Arca Swiss Monoball and was leaning towards getting the sidekick, but I decided to get the Full Gimbal instead. I also ordered four P20 plates, a P30 plate, two P5 plates and Lowepro bags for both the Monoball and Gimbal Head. This all cost more than the average L lens
Wow, thats stuffs expensive
I went with the full head over the sidekick for the simple reason that I plan on having a 500 F/4L IS or 400 F/2.8L IS or both in the next few years. I know the sidekick can handle the 500, but from the reviews I read, most people were happier with the full gimbal with the very large lenses. And another thing is, if taken care of properly, this items will last a very long time. No electronics to go out dated 



