Sound is on par with Shure products at similar prices. (I prefer the Shure sound but their latest offerings aren't too comfortable in my ears). So that's a glowing review on the audio from me.
But the Re-600 formed a short near the headphone jack real quick, then cable started pushing itself out of the fabric jacket in another spot (I take good care & don't abuse headphones). The company was quite rude to me & did not honor the warranty due to some weird fine print. Inexcusable, I will never consider another product from this company. They brought no joy to my life.

I like these more than my Monster Turbines. Less good than the Shure e4c, different price point I know. They're more difficult to insert than the average IEM. Other users seem to find them comfortable enough but not me, not at all. Extended listening gives me a bit of pain. The ear tips are fantastic, it's the phones themselves & how they angle into my ear plus the cable. Initially I wanted to replace my broke e4cs with a current $300ish Shure IEM, I'm glad I picked these up so I know not to go with the current Shure designs on the pricier models. The sound is good but I've never "loved" these headphones like I have others in the past.
Being disappointed with three well reviewed $100ish IEMs (Turbines, SE215 & Bose IE2), I might save for pricier IEMs and stick with "out-ear" when there's only $100 in my pocket. 

After a six year love affair with a pair of Shure e4cs, they bit the dust & my wallet didn't allow for a similar investment. On my trip to J&R the day before an international flight, they were sold out of the Sure 215's I planned to try out. So I picked up the Turbines.
First out of the box I was greeted with several inner boxes, on my subway ride home a gratuitous pile of cardboard & plastics formed around my feet. What's that you say Turbines? "Life is too short for bad headphones." Did your CEO write that copy? What's with audio gear & embarrassing copy? Oh look, two carry cases, both disgusting.
So let me get this out of the way, within four months they were broke. Apparently this doesn't seem to be the norm so I'll try to hold my hatred at bay.

1. Bass good. When listening to tracks & genres with great bass these headphones became quite "fun".
2. Symmetrical buds means you must annoyingly use brain power & eyes to know which ear is left & right.
3. Broken

I replaced with Shure SE215. Similar price, I like them better, although the Turbine's have superior bass & comfort. But no "love" for either model.