So far I've been listening mainly to the SR225 and nuforce udac since I got them.
I love the grados. They are so incredibly light on your head and comfy as hell.
A lot of people mention that grados are uncomfy and I've found that after about 3-4 hours listening my ears do get a little bit sore at the top from the small amount of force exerted on them. But overall the lack of weight makes such a big difference.
Compared to them, the AKG K601s feel like a vice clamp on my head and I find myself fiddling with the K601s all the time while wearing them.
Sound quality wise the K601s seem to have more detail and more/lower bass than the grados.
I'm doing a brief comparison between the headstage lyrix and the nuforce udac right now and the lyrix has a lot more bass, especially with the bass boost turned on. This could be why I thought the K601s had more bass than the sr225 as I havent tried the K601 on the udac properly yet.
Bottom line is I love the grados and will definately be keeping them. After a properly detailed comparison between them all I'll most likely be selling the Hd595 and the K601 even though they may have more detail than the grados. The grados just grab me in a way that the others don't seem to do.
Music wise I've been listening mainly to electronic stuff: Apparat, Boards of Canada, Moderat, Trentemoller, Plastikman,
and a little bit of non-electronic: Imogen Heap, Frou Frou and JJ Cale.