This product is one of the best electronic purchase I have done this year. If you do not want to missed a wedding shot while the bride is walking down the aisle this is what you need. This will give your speedlite or flash a fast recycle time ( 1.3 seconds ). I used this with my Nikon SB 910 and with my Cactus RF60. I also purchase the cable. For your Cactus flash go and get the Canon cable. It is reasonably price with the best customer service in Calgary.