Cochlear implants
For children using a cochlear implant, research indicates that fitting the non-implanted ear (with a sever/profound loss) can provide real life benefits in speech perception, localization and speech production (Ching TY, Psarros C, Hill M, Dillon H. Incerti P. Should children who use cochlear implants wear hearing aids in the opposite ear? Ear Hear 2001 Oct; 22(5): 365-80).
You can read an abstract of the article at the online PubMed library. The PubMed library also offers you the possibility to order the whole article.
SUMO’s extra low frequency amplification make it an ideal solution in such cases, since it can provide an excellent balance between the cochlear implant and the hearing aid.