I've noticed a big difference, with my buddy who has Turtle beach sevens and mine. While his has a better music profile, mine are like 20% better at the spacial awareness, and I don't have to deal with his complicated as fudge audio controller.
I personally love my Tiamat 7.1's but you have to make sure you configure them. Alot of people don't run the right equipment with them which makes them sound muttled. I( once i figured this out) love them to death.