I like the sound of the 997.2 PSE. Right amount of noise in all rev range without droning and frenetic cacophonies. Some after market systems may sound good at high revs but monotonous with low frequency booming at 2-3000rpm for example i.e. terrible and tiring at low speed in town. I had a Techart exhaust like that once.
I enjoy the sound even in the OFF position, which is much different compared to the standard exhaust BTW. One obstacle is that the sound in a 911 is remote due to the engine position so from inside it is not as loud as a M-E car. But find a winding mountain road with good echo, where you would use the first 3 gears, switch PSE ON, open the window 2-3 cm and enjoy the character and the quality of Porsche engine sound
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"Form follows function"