Grown in an unheated greenhouse in Iceland: fruited decently. A tomato plant labeled "Polar Star???" (I can't be positive, the label got lost!) ranked #1 out of 6 in a taste test, with one participant insisting on breaking the 0-10 scale and giving it a 12.
Grew well outdoors here but did not fruit this year (due to a cold summer, only Polar Baby did)