+1, it seems that of all the headsets out there the CK headset installation is the one that really benefits from using the long bolt or all-thread w/ nuts and large washers because it keeps the pressure on the outside of the cups and off of the bearings that are factory installed in the cups.

I've got a CK headset I've used on three different mountain bikes, and on all three installations I've used the simple large bolt/nuts/washers tool to install it. Our shop is a CK dealer and we have the special CK installation tools, but it can be done safely without them.