7.1 usb adapter?

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Dr.gB
im planning to buy a new headset,
,my budget is 3-3.5 k.
i was planning to buy gamecom 777.coz of the 7.1 virtual surround sound.
but i came across this in ebay

USB Sound Card Adapter Audio Input Output 7.1 Channel with Mic Input | eBay

if the above gadget is a sucssess,i could go for an cheaper gamecom 367 or alienware tactx headset,or similar headset in 3k.

any one used a 7.1 surround usb adapter before????
should i buy a headset + this gadget or go for gamecom 777 or similar surround sound headset???

any help?
thnx in advance.
 
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