I have stuck on a set of HM5 pads and am pretty pleased with the result now I've cut out the stretched mesh covering the openings (is there a technical term for this?).
I never had a problem with the T90's being bright but boy if I go back to the stock pads, oosh-they are a bit shrill!
When I put the HM5's I was struck by the difference but it wasn't all good. I felt they muddied the sound somewhat and I was losing so of the exquisite detail, the sense rather than the sound of the music was missing.
So, I took a pair of scissors to the mesh and now I'm pretty happy. The detail, the weight of the music is back.
As a side note I have also upgraded from the Micro iCan to the Micro iCan SE. I will do a proper review of it soon but in the meantime if you're on the fence - just upgrade already. The iCan is good, the iCan SE is much better. If you're thinking of buying one or the other, for the few dollars price difference just buy the SE...