The units that I tried and were satisfied with are the Interton Avio3 which Costco is now selling.
They are the best that I tried based on relatively short sessions with four different audiologists. One would think that there would be some centers where say 20 or so different aids could be auditioned OR some testing lab like CR that would have comparative performance numbers.
Integration of amplified sound and direct sound (no echos or artifacts) are important to me since I have little loss below 1 kHz. Based on a relatively short listen, the Oticon Epoqs WV were good also. The big difference is that the Avio3s will cost $1,400 each (about the best value out there) versus about $3,000 for the Epoqs and several others. This is a difference of over 100% for no apparent difference (to me) other than features which didn’t directly relate to hearing quality (such as remotes and bluetooth add ons).
The bottom line for me was the ability to wear evaluation units for a few weeks and especially spend some time listening to my high end sound system. In audiophile terms, I found that the Avio3s gave me an openness that had gradually vanished as my high frequency hearing diminished. Transients are handled well as are frequency response and dynamic range. Could it be better? Probably so, but I found it to be good enough (and I am fussy).
Sorry for the intrigue, but that was the request of the manufacturers rep in return for providing an evaluation pair prior to their introduction.
Another observation which is probably true with any hearing aid that restores high frequency loss is that my tinnitus became slightly less pronounced. I guess that this is due to the masking effect of the amplified highs that are in the same frequency range of the tinnitus.