I have the Signia Pure Primax 5. Although I was fairly happy with them for the first few weeks, my experience has been disappointing since. The aids perform inconsistently, the remote settings on my phone lose their function (sound programs - I did not purchase the transmitter for calls through the aids), and adjustments by my audiologist have not been of any lasting benefit. They 'work' in amplifying sound to some degree, but the performance has deteriorated and their advertised benefits in terms of custom settings for differing environments - in my experience - are non-existent. As I replace these in another year (my insurance covers a portion of the cost on 2-year rotations), I will not consider this brand again.