As a new HA user, I vote for Costco, and heartily endorse the notion that the person who fits your HA’S is the key to success. The initial computer designed fitting may get you close, but sound quality (depending on your degree of impairment) really is about the skill of the person doing the final touches. One key I have found is to make sure the fitter understands the effect of compression on sound quality, and how to adjust compression at different frequencies to produce natural sound.