Im a big fan of mine, I did notice some (very little) extra noise with it switched on. Honestly all the compressors Ive used have increased the noise level when not playing (just the nature of how compressors work). However my bass cuts through the mix much better with the m87 and I have a nice even sound from high to low. Mine sits right after my sansamp in the signal chain. BTW I run mine setup like this, the gain LEDs represent my normal amount of attack when playing. Output is set just a touch above unity:
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I'm curious why you like the ratio at 8 opposed to 4?