The very good: The constant discomfort in my neck, shoulder, and upper arm (due to side sleeping) has ended since I began using this pillow.
The good: did not have a strong smell that some other reviews mention.
The bad: As a slender 5'4" woman, I ordered the small version for people 5'5 and under. However, the "tunnel" is so narrow I can barely fit my arm into it. This is made worse by the ill-fitting cover that comes with the pillow, although given the material of the pillow itself, you need this cover in addition to a pillow case. Finally, if I shift from one side to the other during the night, I have to fully wake up in order to properly place my other arm into the tunnel: not sure if this is due to the too-narrow tunnel or if it would be a problem in the larger size as well.
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