I have been using this app without problems on an iPhone 5s with Signature 6 hearing aids.
Great to have this control. One bug: the battery button is not a button, it is apparently an icon showing battery level, but it doesnt work. Wish it had mid-level tone control slider also. Only reason I gave 4 instead of 5 stars.
Ive used Oticon and Rexton, and this ReSound unit via Costco is my favorite, particularly the ability to tie in to my iPhone for control, music and audio books.
Kaimanaoe about Kirkland Signature Choice