I'm always rotating stock Andre!
It appears that you've accumulated more than me!
I just finished swapping out the Aggie OBP-3 preamp with a new Demeter pre.
So much better to my ears. Glassy highs, smooth mids and lows and a slap tone to die for! It really smooths out the sound of ash and opens up the sound of the Roscoe Barts (it leaves just the right amount of natural compression of the Barts).
This one really has a different tone than my mahogany/walnut 3006. Big, thick and throaty verses jazzy smooth.