I have purchased from a ZipHearing audiologist (when I purchased my Lumity90’s) who does not do REM and I was very happy. Only about 1/3 of the audiologists in the US use REM, so take that for what it is worth. In a discussion with one of the professionals on this forum, it was pointed out that REM is most helpful in cases where you have a smaller or larger than average ear canal. I guess mine fell into the average category or my audiologist was experienced enough to adjust for that. The I90 should be very helpful in noisy situations otherwise I have not noticed a significant difference in the I90 from my old P90’s
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