Only issue I ever had with the T0’s was the volume not coming back on after it went into power saving mode when using USB. I found when using Optical cable it had those issues way less. Also just pressing volume up or down on the remote always wakes it back up.

I doubt it’d be worth upgrading for the minor enhancements of the T0+.

I don’t have biases to any brand. But haven’t Klipsch and others also been known to greatly exaggerate their sensitivity ratings?