I used the qc-15's with the u-fly mic for a number of years. They work great but the current model has some reliability issues and I ended up in a pattern of sending the mics back every 2-3 years or so. The service is great from the company so sending them back isn't that big a deal but you always end up with this period before you send them back where things don't work quite right. Some FO's also find the left side only arrangement of the mic to be annoying. U-fly mic has an option for an extra long mic boom...I would definetly get that.

Now I use A-20's and although they aren't quite as comfortable as the QC-15 setup, the noise cancellation is FAR superior.

Having used both, i drive to work and usually do trans-cons & West coast-Hawaii I much prefer the A-20s for durability and noise reduction. If I were commuting still, I would go for the QC-15/ufly setup so that I would have one headset for riding in the front or the back.