First , clipping sounds dont really make much of an appearance anymore .
I'm not sure why that happens but its somethiing i never expected would be rectified .
Also ( big one for tha mx ) when tubes are up at max with loads going on u can still hear everything , but in a qaulity fizzly ( much more noticable than standard tubes ) kinda tone . Even when my mx was brand new i was dissapointed at the funny metalic-like buzzing the tubes made with alot of bass , not so now , BIG improvement

instanly All harmonics take a step up even at no tube level ( although sound actually goes thru the tubes at all times , just a little or alot ) and up higher , sounds have a bigger impact on the tubes giving the mx even more of a distinct tone . U'll b amazed at how even a little tube effect can change ur tone .
I held down a BASSY tone n slowly added gain , the changes were much more noticable , more like what u would've preffered in the first place from tubes ... the mx sounds much better without my compressor now .
U can hear the difference 4 sure , more refined yet capable of a better electric/grit effect on ur mix . Also they sound as if they compress more too .

bear in mind that all tubes will have distinct characteristics , so if u get new ones keep ur old ones 4 sure . Mine are flat as a pancake after 5 years , but still hav uses .
Ok , trust me .... Upgrade .

Hope i cover all plus points ( except i got a dodgy nipple on one of my new boobs !?... nevermind ) . get em in boys , get em in ..... l8tr