I find Kreg screws to be excellent.  I have never had the head of a Kreg screw break off, and the square drive hole is nearly impossible to strip out; although, I have managed it a time or two.  These course screws enter the wood very quickly and will need a pilot hole in many applications in spite of the "drill it while it screws itself in" point.  I have split a number of pieces of wood with these screws and often use the fine screws instead to prevent splits.  Good in particle board, but not on the ends.  You MUST drill a good sized pilot hole to prevent these screws from splitting out the particle board.