Are you confused as to whether a listening device, used in conjunction with a hearing aid, will help in those situations where hearing is difficult?  I am thinking of watching TV, in the car, listening to lectures etc.
If you are then you might be interested in looking at my blog.  www.listeningdevicesforthedeaf.blogspot.com  The advice is entirely non commercial and is not sponsored.  It is an honest opinion of the devices I have tried in the last 6 months.