I never saw that particular ESS model, however I have heard a number of models in their day.
ESS speakers always sounded poor to me, with very poor integration of woofer and the Heil unit.
The Transar 1 was a disaster and very unreliable. Failure I believe was 100% in short order.
The Transar II was not so unreliable, but had a reputation for poor sound along with the rest of their range.
ESS had a reputation without parallel for dealer and customer abuse.
No one shed a tear over their bankruptcy.