The Siberia 650 stands apart from the competition in terms of style, offering the same suspension design as its siblings but just a tad more "premium-looking" according to Tom's Guide. PC World thinks it's "definitely polarizing," evidenced by the fact that TechRadar thinks the headset looks ridiculous, while NDTV Gadgets says that "anyone with good taste will agree that this is a beautiful pair of headphones." In the end, PC World appreciates that it "doesn't look like just another dumb gaming headset" and instead "makes me feel like I live in 2001: A Space Odyssey." But the suspension design is about more than just futuristic looks: Tom's Guide also calls it the "coziest set of cans I've cupped over my ears."
And once you cup these over your ears, you'll be treated to "big and boomy" audio that PC Authority found fatiguing after a while due to compressed sounds "fighting each other to break clear." TweakTown was more positive, finding that the Siberia 650's audio quality made it possible to pick out minute details. However, NDTV Gadgets says that some of the faintest sounds felt "just a little too wide and unspecific thanks to its subtlety," while stereo music sounded "weak and lacking in any excitement whatsoever." Hardware Heaven does note that the "level of configuration available from the SteelSeries Engine is good," meaning its possible to tweak some of these to your liking, and TweakTown was able to "make the Prism's sound truly boom."
If you're not willing to work with the software to get the best sound and only want the Siberia 650 for its looks and comfort, it might be better to just opt for one of its cheaper siblings instead. But if you put in the time, you can still churn out premium sound from this premium-priced headset.