Im not sure about the Egglestons, but I’ve had my Yamaha NS-1000s and NS-2000s for quite a long time. Refinished the NS1000s twice since I’ve had them, the last time a complete reveneer and crossover rebuild roughly 6 or 7 months ago. I still love them like they were new. They had put up with anything I’ve thrown at them from tubes to SS and sounded great doing it, I’ve under powered them with a pair of mc30s and dynaco mkiis and over powered them with mono MC7300s and they still love me. That being said I could prob use them the rest of my life, or untill the JBL Project Everest DD67000 come more into my price range, but that’s about the only speaker I would put the yams in the closet for.