The professionals at Arizona Desert ENT are more than exceptional and they are a 5 star+++. Although this review is not for Arizona Desert ENT but in my opinion a warning to those who want to purchase Phonak P90 the "top of the line" hearing aids. I have from the very beginning have had nothing but problems: The software on my phone never working correctly, but more importantly a consistent issue with the right hearing aid failing: battery being dead after 7 to 8 hours of use, or again the right cross over hearing aid not wanting to charge, dead shorts or even worse when you already have ringing in your ear - scratching, high pitched screeching, crackle from a bad unit. The office did testing and yes the right hearing aid was bad. I waited for about 3 weeks to obtain the "new hearing aid" from the MFG. Looked new, clean but within in one week it is now back to right hearing aid not working past 7 to 8 hours then the screeching and crackling once again. This has been on going with many issues for the past year. For $6300 this is beyond exceptionable and in my opinion it seems the MFG tried to pawn this right bad hearing aid unit as "NEW". Stay tuned to see if the MFG does the right thing but trust when I say stay away from Phonak as the MFG are all smiles to get the money but the product is only as good as when it performs...the performance is not worth the money. When it does work its the best. SHAME ON PHONAK - I am a business person who owns my own company and in my opinion seems someone pulled a fast one. Escalating yet again.