Poke,
I can’t speak for the Stringray, but I had a pair of Neoclassic 250s once upon a time. They were around 10 years old, maybe a little older, if I remember correctly. I was the second owner.
Truly a great product with great customer service. Never had a day of issue outside of delivery. After being jostled around, one of the tubes had a meltdown and took out a cathode resistor.
Manley had new resistors soldered with clip-ons for easy installation for the soldered-challenged out to me in a few days.
Only got rid of them because 20 EL34s made my small room quite toasty and I’m a cold-weather bear.
Definitely miss them.