Looking at the chart, the only three items that are really statistically significant given the survey size and scope of the question are ‘visibility’, ‘ongoing expense’ and ‘battery life’.
I’m assuming also that there’s a (potentially erroneous) correlation between ‘premium’ and the smallest devices on the market.
Lets look at those separately:
Premium IIC will have the lowest visibility, premium RIC will score the same as the other models.
Ongoing expense - I’m assuming that relates to CIC/IIC failures, as all other aspects would be the same for both kinds of models. It’s inherent in the design of the smallest CIC that you will get more wax failures than any other type of device - simply due to the proximity of the Mic screen to the EAM. RIC failures are no more likely with either type.
Not forgetting the madness that is the Lyric.
Battery Life: Again, the smallest CIC/IIC and RIC will be using at #10 battery - probably marketed as the premium devices - hence the lower satisfaction of these models.
The rest is pretty inconsequential, apart from the manufacturers needing to look at the last three to further improve overall performance in these areas.
Opn1 or Opn3? you decide…