I actually checked carefully and when I made the comment above I was around 40 hours actually. I'm now at 50 something and the coloration is starting to diminish by a tiny amount (I'm reducing the EQ).
And I don't think it's a case of brain burn in, as I regularly compared it to my other phones (SM3). Most likely a temporary burn in variation. Bass quantity is still increasing and starts to fill in the upper bass / lower midrange (good thing).
They're technically getting impressive (at last) and now clearly surpass any other portable phones I've tried (SRH840, HD-25, P5). The bass is very nice as It isn't too dry and yet maintains good speed. I've heard quite good amounts of details in Massive Attack's Angel in the bass line I did not notice before, and with no distortion so far (or at least I don't hear it as I don't really know how to spot it unless it's glaringly obvious :)). Soundstage is rather closed in, except when I balance their frequency response with EQ. It then becomes really really good.
Otherwise the build quality really is rubbish for headphones that expensive. I've seen better in cheaper ones. Plastic parts are smelling troubles from kilometers away :).
thats some good impressions
but i hope the t50p will beat it
cause i just ordered one