Hi Gyate .....
Although I do not have the Power Plus, I find in noisy restaurants if I want to hear another person speaking, I cup my hand around my hearing ear to block out the noise behind and to the side of it. The problem is not that the hearing device is useless, but rather being SSD (single side deaf). All sounds are directed to the only working auditory nerve. The brain simply no longer can distinguish location of sound so it perceives all of the sounds more equally to try to offset this. At least this is how my audiologist explained it to me.
When I cup my ear, it blocks much of the useless noise and allows my Ponto to pick up the desired voices/sounds.
Hope that helps.