Review on Jabra 2400 Mono Wired Headset by Marko Forth

This is quite an expensive headset. So I expected a great performance. I ran A/B tests with a $25 headset and everyone I spoke to said the other (cheaper) one sounded much better. I have a feeling the ULTRA noise canceling feature might have something to do with it. I'm using it on an iPhone 6. I didn't do a lot of testing on the noise-cancelling properties, mainly because it was good enough when using a $25 headset with standard N/C. This one probably transmits less background noise, but what's the difference with poor voice quality? I sent the headphones back after about a week.