I am considering buying a Canon 380ex flash unit for my G1. When I called Canon this wasn't one of the flashes they recomended. Even though it says you can use it in the manual. Is anyone using this flash and do you have any problems or limitations. Should I just wait and save up for a 420 flash or will the 380 work? What features won't work with the 380 and the G1? What would be the advantage of getting the 420? Any comments are most appreciated.