Echo and TMR are great people. Have done many transactions with echo for over 29 years, I’ve done more with TMR in the last 5 years. Echo does have their biases toward there new products, TMR is more neutral.
I always go listen to the speakers if buying used, if new, I can go into a dealer or order online.
As for age, 10 years isn’t that old with newer speakers. I’ve even had 20 year old cheaper speakers that sounded very good and would last many more years. For example, I would not hesitate on buying a pair of Revel salon 1’s or studio 1’s today, and they are 20 years old. The more reputable manufacturers have rebuild services which could be much cheaper than buying a new pair.