I got one of these to use with my Rebel XT and I use it on ETTL/Auto mode. All of my shots were underexposed. Then I messed around with manual mode and the shots were *way* too bright. I tried reading the manual but it was not helpful at all (I was completely lost). I thought ETTL was supposed to calculate everything for me but it's hardly an improvement over the built in flash. I was wondering if anyone familiar with this flash can give me tips. Should I toss it and buy a 430EX instead?