3 of 4 people found the following review helpful
You get what you pay for,
This review is from: Sennheiser IE 8i High-fidelity Ear-Canal Headset with Smart Remote with Mic to Control iPhone (Wireless Phone Accessory)
Yes, they are expensive. Yes, they are worth it. As all the positive reviews say, these have to be one of the best IEM's out there.
The only thing I have to add is fitting the right plugs for your ears is key. I ended up having to use different sized ones for each ear in-order to get the best fit.