Replace pwr cord w/IEC socket on vintage gear?

I have thought about this many times, as I own a fair amount of gear from the '80s. Yesterday I picked up a KILLER Heathkit pwr amp, but it has a really wimpy pwr cord. The shop where I bought it will install an IEC socket for 1 hr. labor plus the part. Given that this opens the amp up to the world of better power cords, this seems like an attractive, low-cost upgrade.

Has anybody here done it, and how'd it turn out?