I have used Kenrick straps and controllers and found them excellent. The only slight issue I had was the velcro tabs that hold the straps closed can come loose with use.
The controllers themselves are easy to use and reliable. I have a Digifire 7 (see
http://www.bintel.com.au/Accessories...oductview.aspx) and it has 6 outputs. Four are adjustable in 10% increments while 2 have full power.
Malcolm