I have been looking around a bit at the different helmets, and I came to wonder if anyone knows a bit more about it.
It has been mentioned, and also seems apparent that the SDS battlespec has undergone a few changes recently. The positive ones being a better cut around the eyes and teeth, as well as a handpainted frown, maybe even in a more accurate color. However, from what very few pictures I have seen of the newer battlespec, it seems the chin piece is cut a lot sloppier, looking more like a black splotch. Not that it would hard to clean up, but still. The asymmetry also seems a bit of, where one tube just looks much larger than the other one. The ear pieces also stick out a lot more.
Thing is, apart from the improvements, I get the impression the "old" battlespec had an all around closer resemblance to the more accurate ones..
I came to think of it when looking at the pictures in this thread (nothing harsh meant on your helmet Dmian, just a little curious). When compared to most other battlespecs I haven seen which have been of the older variety and all looked like the battlespec in the SDS page over at Star Wars Helmets.
Should anyone happen to be a little wiser than me on this? My eyes could easily be cheating me.