I still have a pair of original ESS AMT1's and they have served me well for many years. The only problems I have had has been with bass unit foam surrounds rotting. The sound quality has been first class even against today's competition. I am at the moment in the need of new bass units due to, you've guested it, rotted foam surrounds, but I am trying to source replacement units or repair. These babies are too good to scrap.PS I live in England, UK and bought them in 1974!!!