The Pure filter is awesome - early morning race, just after sunrise, autumn, broken cloud cover. The early phase, the colours are convincingly muted. As the sun rises higher, the colours get stronger, but never overpowering or unreal, in cloud shadow (and other shadows) the details remain clear.
I did have problems at night: with the moon behind a cloud, the god rays were way too bright (and at times blind), but I guess that's a tweak for 2.1.