The might be okay at low level of hearing loss but at higher levels, the noise cancelling/selection tech is still lacking compared to what a human mind can do.

The might be okay at low level of hearing loss but at higher levels, the noise cancelling/selection tech is still lacking compared to what a human mind can do. Its still difficult in a crowded store trying to focus on what the cashier is saying among others chatting, background music, etc. Typically hearing aids have two mics on each hearing aid so they can focus on the front or omni directional but the intelligent switching is not that good.