I own Grado this and Sennheiser that, even a decent pair of JVC the other, but one of my favourite, best sounding and most comfortable sets is my Superlux HD681s. €20.

I believe they use the same drivers (and superficial design) as AKG K240s.

In this case, they passed the tests reasonably well I think. Great frequency response (cut in at the limits of my hearing), no rattle, all the rest... I might put together a few sets for this test, though I suspect the Grados will fail rattle :)