No NC headphone is going to help with crying babies. They are only effective for constant low-frequency sounds like the drone of jet engines and air conditioning.

This week I have my first opportunity to do a side-by-side test in-flight between Bose QC2 and Shure E3. This was on an AA 777 flight ORD to NRT, so plenty of time to test and compare. I have been using my Shure E3's for some time now and have only used the Bose on a few AA international J flights. This was my first with the QC2's.

The bose certainly work well for descreasing the low-frequency sounds. But they do add a significant amount of higher frequency noise (hiss). They are comfortable when sitting, but don't try to lie with your head sideways on a pillow. The 30dB noise reduction claim in a previous post is an exageration. They can be worn while holding a conversation with the FA or a seat partner.

The Shure E3's are a lot more sensitive (at least 6dB if not more like 10-12dB), so the audio source can be operated a lower level reducing the noise of the amplifier itself. The isolation from the E3's cuts out the low frequency drones (engines, air conditioning etc) at least as well as the Bose, without the addition of the hiss. They are also easier for sleeping. They most definately must be removed to hold a conversation with the FA or a seat partner.

However, some poeple find wearing in-ear phones uncomfortable, even with the fit-kit provided with the Shures (various size and flexibility sleeves).

For the price (US$137 delivered, less than half the Bose QC2), and the very small package to carry around, I will be sticking with my E3's.