I purchased a set of the radio trigger/reciever and an extra reciever on ebay. The trigger and one of the recievers work great with all my flashes except my 430EX(it fires whenever it wants) which I have read on hear some times have troubles with these recievers.The other flashes I have are a Bower SF829TW,Sunpak Auto Zoom 331, and Promaster 1000. The Bower only works if I use the PC cable. With the extra reciever I purchased, the only flash that works with it is the Sunpack. The Promaster will not fire on it and the Bower fires whenever it wants. I noticed the little blue switches on the trigger and recievers so I tried switching them around but can't get it to work with the other flashes. Does anyone have any experience with these? How do the blue switches work? What flashes do you have that work with them? Any advice or wisdom is appreciated. Thanks!