By the way, I hadn't pulled out my M-100 recently until I picked up a V-Modex (DIY V-Moda/Fostex T50RP hybrid).
Anyway I had just received my Tera Player back from repair on the same day I received my V-Modex and thought I'd play around with these phones with the Tera.
The M-100 pairs very nicely with the M-100 rather interestingly. The dynamics seem to blossom more nicely and the M-100 seems to amplify the Tera Player's analogue-like signature. I've not tried the M-100 with my tube amps yet but may try that next.