Pros: Sound, Earfins, Neutrality, Isolation
Cons: Cable length is funky, and a little thin
Want a gym IEM that'll stay in your ears no matter what AND sound good? Look no further. This is the be all end all for good sound while running/biking/lifting
Neutral sound with crisp highs fairly detailed mids and a bass section that morphs properly to each music genre (listened to techno, hip-hop, rock on these, would you really listen to other genre's at the gym?) Overall these are pretty neutral, and therefore quite non-fatiguing. However they have enough versatility that even bass-head music such as dubstep sounds good on these. Which is probably quite good for an IEM. (I have little experience with IEM's as I usually don't care for their fit) For the price they sound quite good. They certainly bear the Sennheiser house sound as well.
Comfortable, the fins are rubber and surprisingly not noticable, but hey HOLD very very well. Also comes with three different sizes of "buds" and "fins" for different sized ears. I'm sure they won't fit everyone, but I'd say they'd safely fit about 95% of users.
These run great out of anything, no amp needed. I hooked them into my fiio e5 and noticed no improvement.
The cable is in two lengths, a standard (which won't reach my waist and I'm only 5'5") and the extension which includes the volume nob (extends to 3ft). So prepare to have some extra cable (unless your a giant)
Also cable splitting to each ear bud is thin, make sure they are secure otherwise they'll rub and pick up noise.
Also shop for a better price, they retail at 80-90$ I got mine for 55$ but I've seen them as cheap as 42$ (kicks self)
If you are highly active, get these, they sound as good if not better than most IEM's in their price range, and the fins are brilliant.
I've liked them so much that I have felt no motivation to find a dedicated IEM even when NOT at the gym.