So being ceramic doesn't have much effect but the main point is the oversize wheels, which as you say, spin slower and therefore have less friction. Normal bearings or not, they are more efficient. But its just minimal and HTFU has the same effect.
Enough to quantify the price vs power saving?
Marginal gains in wattage, vast gains in slavery.
@Chak started
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So being ceramic doesn't have much effect but the main point is the oversize wheels, which as you say, spin slower and therefore have less friction. Normal bearings or not, they are more efficient. But its just minimal and HTFU has the same effect.