I use the kit since about 1 month. In the studio with my Blitzanlage far about 1500 trips, there was not a single problem. As sync speed I can use to 1/150 sec, 1/200 is there a black bar from the curtain. I use the Nikon D7000 and the Walimex VC400 Plus flashes. The power source I've currently normal batteries in use until now still the first set. When these are empty, I'll switch to Eneloops. Should then problems arise, I will register a. The micro-switch for the channel setting are mounted between the batteries. Is somewhat "tricky" to switch them, but that makes you actually already once. And then they are well protected against accidental changes. Outdoors it is very useful if, for example, the flash control no longer works in bright sunshine on the camera (D7000). One then has not more the CLS control, but that is indeed so in the description and would have been this low price could not be otherwise possible. The camera-trigger works great, I've got it up to 70 m range tested. I am absolutely satisfied with the triggers and the set will still buy 2x in order to work with the flash meter, etc. via radio can.