Hi, I am a retired teacher and new to the world of photography (more or less). I have a Cannon 40D and have reciently purchased a 580 EX11 speedlight that I have not used much yet. My question is this: I found this accessory kit made by Interfit: INTERFIT STROBIES PORTRAIT KIT It looks like a good kit and I am familiar with the Interfit brand name. Eventually, I hope to do a few weddings. Would this be a good investment?