they are infamous speakers, a legend in speaker history and the pictures prove that they've been in more studios than probably any other....
but not many say they "sound good"...maybe a great tool for mixing, and definitely the "fame name" to them.
and the TP mod was to reduce some shrilling treble tones, the Aerosmith, Making of Pump shows the NS10 with TP over the tweeter in the studio...
there are still arguments of whether one-ply or two-ply TP worked better.