I have a Robert Keeley modded ts-9/ts-808 tubescreamer. That is the best pedal I have ever played, robert keeley pedals are sooooo much better than stock!
He modifies pedals for players like Steve vai, john mayer just to name a couple. It has so much clarity and tone! No mud what so ever! Really great tube like qualities too! Tubescreamers are the holy grail for blues players, they are THE blues pedal to have, thats why SRV used one.

SRV R.I.P....