I got me two of these 150W flash units (http://www.fotoimpex.de/shop/images/artikel/detail/ADOLIGHT_150_Kit.jpg they where in a kit with two umbrellas, black and white one for like 250$) and when shooting analog, they both work in sync but when i use my 400D, they dont. Its either one of the flashes fires when i am focusing with the release button or they dont fire at all together. The dude at the store gave me a synch cable, wich unfortunately doesnt fit so i only had a chance to try this without the cable. will have to go back for that tomorrow. If i still dont get it to work, i will bring the kit back and look for a different solution so feel free and school me on whatever you may think is right..