does anyone here have or has had any experience with these two types of follow focus systems?

I see people here always trying to improve the manual focusing of the Vixia camcorders and these seem to maybe be able to work with them mounted on a rod support system.

indiSYSTEM - indiFOCUSzoom (http://indisystem.com/products/indifocus_zoom#inline_photo)

ikan F3 - Friction Follow Focus (http://www.ikancorp.com/productInfo.php?id=232)


i'm currently looking for a solution to improve the manual focusing on my HF S21 so i'm researching at all the options available.


Any feedback is welcome