Have returned with new Trek520 in tow. Also bought what appear to be the same Cannondales that GAbiker and Swekarl have. Man they are great.
GA I have not had any trouble clipping in with them. (Did have a little trouble clipping out, but that is another story). Maybe mine is not exactly the same shoe? I am using the PD-M424 pedals with the rosin cages. I chose them for their dual use and the extra support from the full cage platform.