For 3D positioning, nothing beats a good pair of stereo headphones with a sound card capable of Dolby Headphone, not sure what CMSS is like as I haven't used it with the 595's before.
Laughing my fornicating bottom off.... of course thats why all the cinemas in the world just have two speakers, one either side of the audience.
now in reality for 3d positioning you need mutiple speakers. and that is a FACT.
now to say that set A of high quality headphones beats set B surrond sound headphones is a matter of oppinion as everyones ears are different, and people prefer different things. this is also a FACT
(before you tell me that im wrong just think if we all liked the same thing there would only be on food on sale, one type of car to drive, one television channel with one programme....EEEKKKK etc

)
to the opening poster and anyone else interested in a gamming suround sound headset, they work quite well and they give a good feeling of surroundsoundedness

(depth) when they are set up correctly.
likewise a nice set of headphones married up to a 3d soundcard will give decent results also, it will be up to you which you think is better.
if you want to use your headphones/headset for more than just gaming then the two speaker headphones are more versitile in my humble oppinion.
for the record i own a set of medusa's and i find them brilliant, it did take quite a while to set them up correctly for my likeing but i think it was worth it.
of course it goes without saying, feel free to now go ahead and tell me i am wrong and i dont know what i am talking about, i mean they are only my ears what do i know.....
