First I was on it because my light has lost its bass. It's a shame, because it is rare to have good low bridge and that was the case with the original microphone.
on the other hand, clarity and grain level, the SP90-3 is higher and it shows especially in a saturated tube amp. The grain is biting into the midrange and well defined in general.
The change in micro did not revolutionize my guitar, I'm happy but I still think that it was not necessary.
But if you want a modern P90 output level hot enough, the microphone should make you happy.