I was able to get out and shoot some birds with my 100-300 this weekend, and after all was said and done, I took about 100 shots. Out of 100 shots I got two keepers. I used all the focus points and High shutter, and that helped out to a small degree. The one thing that was a recurring theme was missed shots...birds half out of frame, birds in frame but OOF. I am considering buying a DSLR since these are the types of shots I love doing, but my growing love of street phototgrpahy has me teetering. I would definitely do more street with :43:, and less BIF. I love the :43:, and was seriously hoping that the AF tracking thing wasn't going to be an issue for me. I love the compactness of the system, the "affordable" long lenses, this community. But unless I am missing something, I think I need to go back to DSLR, most likely a 7D, for the 8 FPS and AF tracking ability. Does anyone have any suggestions for birding and action shots?