not sure I've ever heard of wrapping up knees to DL
and if you're ever locked on a lever belt squatting, you'll probably find out that there's pretty much no comparison to any pronged belt out there
and for the record (for the most part) I do and always will consider wrapping knees almost cheating
I just do it every once in a while because there's a friendly competition thread over @ bodybuilding .com that I kind of do every once in awhile