Polo can maintain those aids for which he has software. When I first started using him he did not have the right software for the aids I had bought in the states at Costco. Before going to Polo I went to the Costco near the Galleria Mall a half dozen times. First I tried on my own then Costco sent a staff person who spoke English, then I brought my own interpreter - nothing worked. As someone above said hearing aids need to be tweaked occasionally so local is a lot easier.
I have a pretty severe hearing loss and have been wearing aids for about thirty years. I have bought 2 pair for myself and one set for my husband and am totally pleased with Polo.