I’ve had my buckwheat pillow for about 5 months now. You have to add or remove material a few times to get the balance right, but it’s worth it.
Things people complain about, but I don’t find bad:
Smell – detectable but not intrusive at all.
Noise – a bit annoying for major adjustments/the first of the night, but for minor adjustments or just while your heads on it, not bad at all.
Weight – definitely heavier than I expected, but I kind of like that.
Things people say are good, but I think aren’t perfect:
Shape holding – pretty good, but tossing/turning will change it minorly throughout the night.
Temperature – it’s not actively cool to the touch, but I think only once has it gotten “too warm” in 5 months.
I think those imperfect properties are probably inherent to a buckwheat pillow, and not a fault of Hullo in particular. I’m overall very satisfied with it.