how do you know that? and headphone and headset aint the same, I tried alot of "gaming" headsets and they suck't then I reluctantly bought a Sennheiser PC-360 and that is the single best headset I have EVER had its just awesome. A really heavy duty cord that dont break, its sturdy, has an excellent microphone and very good sound.
All other headset I have tried has just stopped working in one ear after maybe 6 to 9 months and I'm careful with my headsets so its just bad quality on the others.
PC360 is basically closed version of HD555 .
HD555 is an entry(beginner) level headphone from sennheiser, it's not even the best yet.
my point is, sennheiser is not the only brand that sell headphone that work incredible for gaming.
yes, sennheiser are good for movie and gaming but that doesn't mean it is the most superior for that,
the only reason you've only heard about sennheiser is the same reason you know steelseries, razer and etc. it's called marketing. have you even heard about Shure, Beyerdynamic, Audio Technica? they work as incredible as sennheiser for movie and gaming and make you see that they are not actually incredible but the "gaymen" audio standard are actually very low.
let's think about it like this, "gaymen" product use 90% of their profit for marketing and the rest for product(silly heh.. "develop this product with the pros my ass"), let's say that maybe sennheiser spent 30% for marketing and that's still huge.
have you ever heard of this? http://www.headphone.com/headphones/audeze-lcd-3.p..
that my friend, is ONE of the BEST headphone available on the market.
I heard somewhere that the best combo for gaming is good dolby headphone soundcard and and Sennheiser HD800.
Oh it feels good to wallbang from middle to B site in dust2 just by hearing enemy footstep, I love my Superlux HD699 + VT soundcard combo :)
oh wait.. it doesn't have mic. oh God no... my CS career(?) is over.. but yay I have this $2 microphone that works like charm (: