Most distortion and overdrive pedal have full gain, but they always have a problem, flat gain structure and touch response! Do you remember your first time to play a boutique tube amp head? every frequency have each position, it is a real 3-D tone. Most pedal can not give you a rich gain structure and punch like tube amplifier, only TM-2 classic gold can give you a real high wattage tube amp-like overdrive sound.
TM-2 Classic Gold also have a great feature: the most open sound! it means every boost pedal can get great tone as they boost TM-2 , some boost pedal only sound good when they boost tube amp like classic jcm800, Plexi....etc, if you have TM-2 Classic Gold, you can easilly get great classic rock tone in every amp! I love yjm308 and zw-44 to boost TM-2!
TM-2 classic Gold has 4 kinds of high gain sound, blue(XTC), red(OD lead), grey(bull) and purple(Rectifier), each one has a classic Jcm800 type low gain to be boosted by your pedals.
EGO also design a great EQ system to control your tone in widest range, this EQ system contains Treble, Presence and Scoop, dial treble and presence carefully, you can find a lot of useful overdrive tone.
Download: TM-2 Classic Gold user manual