The two best wireless follow focus devices are the Bartech and the Preston systems.
The preston is pricier but a solid device that won't let you down and it can handle three channels. The Bartech is a single channel system that you can link together to get more than one channel but it does become bulkier as a handset. Both are superb products, but if cost is a factor and you only need one channel I highly recommend the Bartech, bang for you buck you can't beat it. Also I should mention that both manufacturer's have superb customer service.
links:
Bartech :
http://www.bartechengineering.com/
Preston:
http://www.prestoncinema.com/products_FI+Z.html
Joshua Harrison
Thanks, Joshua. What do you think about (Bartech + M-One)...? For lenses Canon/Fujinon? on steadicam?.
Thanks, Alec. Yes I am looking to full my own focus with a gimbal mounted device too