I am trading an Electro Harmonix Holy Grail professionally modded by me for an Electro Harmonix Metal Muff with Top Boost pedal.

The mods I have done are as follows:
1. Changed the Electro Harmonix style DC Jack to a Boss style one so you can use any adaptor for it and not just the EH ones.
2. Made the DC jack's tip negative (this makes it so it will work with other adaptors too and not just the EH ones).
3. Added a 9V battery inside with battery holder (so now you can run the pedal off an adaptor or a battery.
4. Made the input jack a switching jack so that when you unplug from the input jack, the 9V battery and DC Jack will disconnect.

Let me know if anyone has a Metal Muff w/ Top Boost to trade for it. IMHO its a pretty good deal. The Metal Muff with Top Boost is $90 (http://www.musiciansfriend.com/product/ElectroHarmonix-Metal-Muff-with-Top-Boost?sku=153339) and the Holy Grail is $120 (http://www.musiciansfriend.com/product/ElectroHarmonix-Holy-Grail-Reverb-Pedal?sku=153319) which doesnt even include the price of the mods I did.