Follow focus advice..

Hi everyone,

I am new here, I am looking for follow focus advice for my canon camera. Someone suggested me following follow focus

http://www.flycamshoppe.com/fc/PROAIM-X2-Follow-Focus.html


Video

http://www.flycamshoppe.com/fc/PROAIM-V2-DSLR-Follow-Focus.html


https://www.youtube.com/watch?v=RwW64JbV7Mk

Does anyone have any experiance?

Are these really well built or just wastage of money?

Thanks