While I try to use long sync cords connected directly to my studio flashes whenever possible, there are times when this isn't practical. These inexpensive wireless trigger receivers appear to be doing a good job of bridging the gap when times like this come around. So far I haven't experienced any misfires as others have noted. Also, I've tested them up to 40 feet and they work great. They work equally well for my flashes and for studio lighting. They feel quite cheap, but not as much as some claim in my opinion. They don't just fall apart even if dropped (which I accidentally did from a height of 5ft). The trigger transmitter is very light and, like older flashes, is held on the flash shoe with a knurled wheel. Units. This requires an unusually large battery, but they are very common and can be easily ordered online or found at the grand ol' store we all know and love. The supplied release battery is only accessible after unscrewing the upper and lower release cap. There is no convenient battery door. The receiver is powered by standard AAA batteries. The battery compartment cover is a simple sliding piece of plastic. Triggers have hot shoes and sync ports. Both sync ports and hot shoes worked equally well for me. So far I haven't had to search for unused channels as I don't experience any interference in my medium sized city. Overall, while I don't know how well they will perform over time, they are great for now.