I have a silver, red, and a black one.Ive used all 3 with my Shiva, Herbert,6100,Friedman, MkIII, MK IV,Badcat, and even my fully loaded rockman stack sounds absolutely fantastic with any of the g's.I skip the front end of the G, as I never use compression or filter wah(basically what you get with the front end).In those setups I come into the unit via loop 1 return.I recently ran my black one straight into a Bandmaster and and two 64' princeton reverbs with all the bogner pedals and a pitchfactor in its loops..Almost dead quiet.Love it.The delays and chorus's are to die for in them.I also turn rev/trem/ switch channels with it too...I think the TC forum people are hoping for a new one w/the polytune and ditto looper added and switchable effects blocks are all on thier wish lists..Also read lairds white paper on it..It seems though that its either a love or hate with it..I dont even use the whole insert loop,ebtech/balanced cable stuff with mine and ive never had bad noise or hum..I DO use either george L or Premium Lava cable throughout though...Hope this helps ya!