CJ7 & National Spring

A friend of mine (who does not usee the Internet) has a 85 CJ7 and is looking to replace a worn lift. I have suggested National Spring for 4" lift springs. Everyone says that they are the best, but no one seems to be running them.

Anyone running National Spring 4" springs on their CJ (or YJ)? Are they expensive? How good are they really? How might they com pare to, say, Superlift springs (which seem to be highly rated commodity springs)? Any other plusses or minusses with these springs?

thanks

Keith