First year with satsumas (Miyagawa), for me. So far, the better one i got were the green ones. They weren't sweet at all, but slightly acidic and still somewhat aromatic. The yellow ones, weren't acidic at all, but without the acid even the aroma went away, and they tasted, frankly, pretty bland.
Anyway, overall, they aren't the sweetest fruit.
Now, hearing that the frost makes them sweeter, I hope that the last one i left on the plant will taste better. First frost should hit here in a month or so, so i'll have a way to check this.