I would guess that it varies dependant upon the route - for instance - if you are going to try Mirage, make sure you take some Aliens (specifically the yellow one) and a Black Diamond #2 cam. Those are the only two pieces that will hold a fall on the slab (though the Black Diamond is in a flared placement - so that may not hold a big fall anyway!) The three-quarter and half cams mentioned in the guide are bollocks - for they fall out if moved sideways (and it's a right-trending traverse - so you better believe they will).