There is no way the grip on a DC (or any skate shoe for that matter) is as good as a 5:10 sole.
maybe, but if anything, i found 5:10's too grippy*.
(*for me. a more skillful rider would be more able to get their foot in the right place first time)
oh, and Dave; AM40's aren't SPD…
i think highly of 5:10 impacts, but mine fell apart rather too quickly. i replaced them with AM40's because they were cheaper and other people seemed to like them.
when my AM40's die**, i'll probably try something else.
(**2 years in and no sign of it yet – if anything, they've just worn in)
i really like the optional sole-stiffener thingy you get with AM40's.