You haven’t seen a lot of positive (or negative, either, I’m guessing) reviews because the Alera just came out. Give it a month or so and you’ll see some user reviews.
There’s a lot of interest in the Alera because of the Bluetooth feature that doesn’t require an around-the-neck accessory. In another thread, though, people complain that there’s still a small degree of lag common to other Bluetooth aids. I want to try the Alera, but I think the lag will bother me when watching TV and film, especially when viewing TV or film with others who are not using aids and so sound comes through both in real-time and with lag.
ReSound also markets the Alera as having an enhanced “surround sound” that enables users to localize sounds in the surround field, but this “sounds” like marketing hype to me. (How does it perform differently than other digital aids?) Still worth a test trial to see how it works.