The noise cancellation does work/ Consider foam tips
I've used the higher quality over the ear hearing aids (with frequency switching) for a few years but there were always times when I had to take them off.  Mainly they were useless in an environment where there was background blower or fan noise or something similar because it amplified everything.  I was a bit apprehensive since these were actually cheaper than my previous ones but the specs all looked good when compared with higher priced units.  Glad I bought them- the noise cancellation works.  And where I was turning the volume on my others up to 5 or 6 I'm using these at 2.  I'm really pleased with the performance.  I rated the comfort 4 for 2 reasons- I wish it gave you a little more time to get it seated before it switched on and the tight fit takes a little getting used to.  Update- I wanted to have back up tips so I ordered some foam ones.  Much more comfortable than the OEM but may well not last as long.
Rating: 5 stars