Razer's Blackshark Battlefield 3 edition is an exceedingly well-built set of cans. High-quality rubberised cabling, leatherette ear pads and head band, strong metal construction and well-designed joints exude a feeling of quality.
While the audio cable isn't detachable, the boom mic certainly is, and a metal cover is included to fill the gap once it's removed. The boom mic itself is lovely; not just swing-down, the arm is also articulated in two points and can be slid away or towards the mouth for accurate placement. The mic itself is foam covered, to properly deal with sibilants.
They're also incredibly comfortable, with the horizontally rotatable circumaural ear pads, adjustable headband and soft leatherette making them a pleasure to wear on your head for extended periods of time.
While Razer talks up the isolation, we found that the headphones only cut off some frequencies, making others more obvious. Once the sound starts though, this no longer becomes a concern.
At 29Ω it's quite low impedance — so much so that we had to drop the Windows volume to around 30 per cent to compensate — and there's no in-line volume control, as is often the case with higher-end sets. As a side effect, we learned that the Blackshark is capable of phenomenal volume levels without the sound breaking up.