The new backpanel has been a welcome improvement, making the speaker an easier load and thus sounding better with both tube and transistor amps.
FWIW they do not benefit from the ability of the amp to double power as the impedance is cut in half, but they do like some power so a tube amp of about 100 watts or more will be the most satisfying direction, as a tube amp will be able to make bass on the speaker with which transistor amps will struggle.
To put this in perspective, if you have a 100 watt tube amp, you will need a 400 watt transistor amp to keep up with it.
FWIW they do not benefit from the ability of the amp to double power as the impedance is cut in half, but they do like some power so a tube amp of about 100 watts or more will be the most satisfying direction, as a tube amp will be able to make bass on the speaker with which transistor amps will struggle.
To put this in perspective, if you have a 100 watt tube amp, you will need a 400 watt transistor amp to keep up with it.