Has anyone verified that this is bi-directional - that you can originate in the US and fly to anywhere in Europe on them and then back home for this discount?

I wouldn't normally fly them - but if this is from already low prices, I can find some ways to use this! Wow. On the other hand, if it is from high-season prices, then a 20% off-season discount FROM high-season isn't much to look at. So has anyone figured out if this is 20% off of high season rates? Or 20% off of low season rates?