I will start off by saying, outright, that compared to the Corsair Void and the Razer Kraken, the Artemis is the undisputed best of the three. I will go into this more later.
I generally don't buy dedicated headsets; i much prefer the sound quality of high end headphones and generally switch between various headphones for listening to music. Bearing that in mind, I didn't like the clutter of using a clip-on mic ( Zalman ) with my headphones, and game sound and music monitoring are completely different beasts, so I decided to go the route of the single USB cable for convenience's sake.
I generally avoid large purchases that I will likely regret, but this is not one of those cases. The G633 ( and by extension the 933) is one of the best headsets you can buy. It looks great, is easy to setup, and sounds fantastic. I would say even objectively, it has the best use of RGB lighting on a headset. Whereas the Void and the Kraken simply illuminate the company logo on a small area, the G633 lights up the logo on the side and a catchy strip on the side which, admittedly, gives it a sort of futuristic, "techy" look. While YOU won't see it very often, it's much nicer than the alternatives.
As far as build quality goes, just about every piece is plastic, but everything is thick with a nice weight to it. The memory foam cushions are nice and soft, but take some time to break in ( about a week or so) before they become really comfortable. Oddly enough, one of the minute features I like on this headset is the inclusion of adjustment level markets on the headband so that you can match up the ear cups easily.
As far as sound quality goes, I would compare these easily to about any entry level audiophile headphone; somewhere between the Brainwavz HM5 and the Audio-Technica M50X. One of the saving features is the built in equalizer, which you can use to make the sound as flat as bassy as needed. The "flat" setting is a little underwhelming, but the "bass" setting works for just about everything and is pretty much perfect for gaming. While I don't normally use the virtual surround sound, it does seem to work fairly well in most games and offers an acceptable surround sound immersion that you wouldn't normally get from a headset of this price.
The mic quality, from what I'm told, is about what you'd expect from a higher end microphone. It seems to be somewhat clearer than the Zalman clip-on mic, but is MUCH MUCH higher quality than the Void ( I'd say the mic quality is the weakest feature of the Void ).
There are only two problems I have with this headset and one isn't entirely the fault of the headset itself; rather Logitech and their software. The G633/G933 feature four buttons on the back of the left cup. The lower most is the mic toggle, the other three can be used for additional features or whatever macro you'd like to use them for. Logically, you can use these for the surround sound toggle, equalizer switch, and headphone mute. The problem is, all of the buttons feel very similar, so you have to remember which is what, and the mic is more easily muted by simply raising it back up.
The Logitech Gaming software, while once lightweight and response, has become weighed down and laggy. I have a high end computer with an adequately OCed CPU and RAM to spare; but the software really likes to lag and crash unexpectedly. An update or two since I've gotten the headset has mostly fixed the crashes, but has not fixed the access time. Generally not important, but if you need to pull it up on the fly to fix or edit something, hope you don't have a split second emergency in whatever game you're playing.