The Turbines are a set of in-ears from Monster. Like Monster's previous effort, the Beats by Dr. Dre, the Turbines put an emphasis on aesthetics. True to their name, the back of the ear buds resemble jet turbines. For in-ears, the Turbines look great. They don't fit quite as well as they look, however. When we were wearing these, we found they popped out quite easily. We'd definitely recommend trying these on for a few hours before you decide to keep them, especially if you plan on using these headphones at the gym. We'd also recommend you be wary of their plug. Portable headphones with a straight plug (as opposed to plugs that have a 90º bend in them) tend to accrue wear and tear quickly when paired with a media player. Since you're moving around, the media player will toss around, putting a lot of stress on the point where the cord meets the plug. Since these headphones dont' have a good guard at that junction, you might want to add your own with some electrical or duct tape.

The Turbines are available for $150.

Performance  (read the full lab performance results at HeadphoneInfo.com)
The Turbines did well on our audio quality tests overall. On our frequency response test, they showed quite a bit of emphasis on bass: they might sound a bit boomy. The headphones also showed a poor response towards the higher end. The headphones did have some distortion, but not a large amount. If you're planning on wearing these headphones outside, the external noise will likely be enough to make the distortion unnoticeable. The Turbines had relatively even tracking, meaning neither the left nor right channel was ever significantly louder level than the other. They were also capable of loud output without a noticeable amount of distortion.

Compared to other in-ear headphones, the Turbines showed average isolation levels. Compared to, say, over-ear or on-ear headphones, the Turbines are far better isolators. They're about on par with a good set of active noise cancellation headphones in terms of total sound blocked out (note, however, that active-canceller block out far more bass frequencies; the Turbines and other in-ears block out more mid-to-high frequencies).

Comparisons  (read more in-depth comparisons at HeadphoneInfo.com)
The Monster Turbines have above average quality, the potential for frequent fit issues, and a price that puts them a bit out of their league. There are certainly better in-ears for this price, such as the Sennheiser CX 95s. There are also good-looking headphones with slightly lower audio quality for a lower price, like the V-MODA Vibe Duos. This being said, if you like the way the Turbines fit or sound, rest assured that they aren't bad headphones: they're decent, but expensive.