Oooh boy, I really don't want to sound like a self-righteous prick, but I do have to address that. Apologies for the tone in advance.
1) "The pro's use it so it must be good" is not a valid argument for a simple reason - Sponsorship deals. The top players and top teams get offered rather large sums of cash for using these products, and as long as it is decent enough, why wouldn't they?
2) If you want a headphone purely for competitive gaming, very few gaming headsets are actually well suited for the task. Most are out simply because of the sound signature they have (wayy too much bass, not enough trebble), poor soundstage and average imaging at best. The cloud 2 is pretty bassy, not very detailed, and while the imaging is decent, the soundstage is not. As far as actual gaming headsets go, around the $100 mark, my pick would be the Cooler Master MH-751, the PC38X/GSP300 is sound-wise a close second.
If you're willing to go with a separate headphone/microphone combo, you have a lot more options. Things like modmics or the V-moda Boom Pro (VMBP) allow us to use proper headphones as headsets. A Philips SHP9600 + VMBP is a killer combo. Or Audio technica ATH-AD700x. Or Beyerdynamic DT-880 Pro. Or Sennheiser HD-560s. Or... I could go on
I mean, if you wanted to go a bit more expensive, it's very hard to beat a DT-1990 in gaming performance, one of the few headphones that can manage that is a Sennheiser HD800, and that's a different price bracket altogether.
3) (I probably should have put this one first for clarity's sake) The sound signature you want for gaming is not something you'd want for your normal headphone to have most of the time. What you want for comp fps is very little bass, balanced mids and LOADS of trebble. Plus good enough soundtage and laser-like imaging. The reason for the sound signature is that footsteps are almost purely trebble and bassy sounds (liek explosions) tend to mask these little details, so tiny bass and murderous amounts of trebble make for a great gaming performance.
Now, if you cared less about competitive games and wanted a more immersive experiance, we can add the bass back in, extend the soundtage and have some fun.