Yes, the JIS cross head is slightly different to the Philips. JIS driver in JIS screw head seem to have very little slop and I don't notice any tendency to cam out. Like anything, I'm sure the better brands will hold tighter manufacturing tolerances. In my photo a few posts above, the JIS bit in the Wera handle is by Anex. Those guys supply tooling to the electronics production lines and their good inserts are beautifully made. Better than Wera and Wiha.