I have two of the original mercury-cell Luna Pros: my original one I bought new in 1986 and a brand-new-looking (but older) one I picked up here in the RFF Classifieds. Unfortunately I only have one adapter, so I have to move it to the other meter on the rare occasions I switch.
Admittedly, I only use a small portion of the meter's features. I use it to measure how many f stops away from "Sunny 16" full sunny daylight I'm at. Two stops? Three stops? For that it works great but for reflective metering I use a Sekonic or a Pentax spotmeter.