Precautions? Just keep wet hair and that Vics VapoRub away from them. Great aquisition! Good other models from the same family to look for are the SRX-Mk IIIs (Monitors, bass light but you can hear everything on the recording. Scary.) and the SR-5N. The latter has the same drivers but more bass and big, soft earcups. And a much more forgiving presentation. Really, really fun to listen to. Just mentioning them because you seem to be really good at finding gear.
Why didn't we turn you on to Stax sooner? You don't find Stax. They find you. Then you're a gonner.