Cynthia:
Although I can't quote statistics, we know anecdotally that one who has been deaf in one ear for a long time will take longer to get the full benefit from TransEar (or any other instrument for that matter) than someone who has only recently lost the ability to hear on one side. In the 18 1/2 years you have had SSD, your brain has learned to cope, and it doesn't expect any information to come from the dead side. So while you might notice immediate benefit, chances are good that your brain will need time to adjust - rewire itself, so to speak. If you decide to go ahead with TransEar, have a little patience with yourself. As others have reported here, TransEar's effects are subtle. In your case, improvements will be gradual and will take more time.
Regards,
Rick Gilbert
V.P. & G.M., Ear Technology Corporation/TransEar