Man if a sap or jack were legal in IL I'd be looking for one yesterday.
As it stands, my thoughts on knives are mostly regarding their utility, but my BJJ gym was drilling some knife defense from guard and I found it involved a lot of trying to tie up the arms and not get stabbed a lot. It's tough to handle a knife from an unarmed perspective, and as a weapon I can see where it can augment a skilled grappler's toolbox.
Although I can't think of a lot of times where getting a dude in side control and stabbing him will play well in court, if he is trying to cave my face in with a rock or a bottle from my guard and I have to stab him a few times so I can stand up and get away...it'll have to do.
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