My main concern was whether they put out enough power to satisfy the sound level I wanted.

More than enough power, I rarely have it over 50%

Only enough power for reasonable volume, in a smaller room (maybe up to about 160 square feet, depends on speaker efficiency)

The volume knob is silky smooth, and the power of this thing is impressive

The power supply is external, and actually has enough power to support the amplifiers full rated output, without strain

Simpler, better power on/off operation.