I got the Junsi replacements pads for the A 1. I mounted them and >I cannot say there is a huge difference with the original sound. Maybe bit tighter bas and more open.
But is it me, or is it the pads, I have the impression, these are much warmer then the original, I sweat really a lot in them. So much , that I am considering, to find the originals again.....
If the pad are too hot and sweaty then you might want to try the Momentum on-ear, for me here in Hawaii where the humidity is quite high I've found the Momentum on-ear to be one of the better breathing headphones, other than a Grado with L pads.
If you decide to try the M50 or M40 then get the Shure velour pads, really helps with the comfort.