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Does your existing ballhead have a dropdown slot so that the Sidekick can be mounted vertically? Does your ballhead have a panorama function (the Sidekick only moves in the vertical plane and requires the ballhead to provide the horizontal plane. The smoothness in the horizontal plane is totally dependent on your ballhead.
Does your Sigma have image stabilization? If so, you should seriously work on hand holding. I've got a great tripod/ballhead/Sidekick combo, but I hand hold over 99% of my shots with my Canon 500mm/f4.
Ballhead does have a dropdown slot and a panorama function. I'll be honest, I don't know that I've ever used the panorama function, so that's something I'll need to check out.