ive had a few minor knee problems in the past, so that makes me want the diagnol heel. but these are going on a big ski, im even considering just getting the 18s, which all have a race pro heel... 
im only 150ish pounds, but im planning on skiing a 12-13 din with whatever bindings i choose. im rambling now... 
seems like its been 50-50 so far in this thread. anyone confirm the pre release issues the first guy mentioned? thanks and +karma