Pros: Great Isolation, Comfortable, Light and stays on the ear.
Cons: Sound clarity, bassy.
I received the sample headphones and was impressed worth the overall quality of the packaging considering that these in ears cost any between $20 to $40, depending on where you purchase them, and if you wish for an in-line mic to place calls from your phone. They come in a range of colours; I got a pair of Teal M6 Sports Headphones, without the mic.
The second environment I used these is playing Roland V Drums (TD 30 K) at my local church as well as practicing on my acoustic kit at home (DW). As a drummer, having IEM's that fit and stay sealed is a huge positive, equally is the sound isolation. I found the M6 to be reasonable at both. Because of the memory wire, you are defiantly able to lock them in position, and using the triple flange ear tip, they seal great. From the Roland, the sound is prominent and big, nice bass from the kick, not boxy at all. Sound isolation when playing an acoustic kit is really good for the price of these in ears. If a CIEM (Custom In Ear Monitor) is a 10/10 for isolation, and Apple's stock ear phones are a 1/10 for isolation, then these would sit around a 7/10. If you are playing with some music, iPhone volume around half way, then you can just hear the drums in the background. I would definitely recommend these for musicians, especially drummers with a low budget.