No matter what lense you have you won't be able to see all that well at twilight. The light is getting progressively darker so the eyes aren't able to really adjust until it's completely dark and you have a constant light.
No i do not, but i am in the market for flat light/low light lense.
That sure was a fun 30 minutes of being blind going down the hill.
Oh, a good lense for flat light would be a nice thing to have, so your not blind on the hill looking at the same damn shade of grey.
I ride several lenses and there isn't really a good one for dusk...but Yellow is your best bet. I ride Chrome Orange during the day, yellow and clear at night. I prefer clear at night over yellow so I just deal with the flat light until my eyes adjust.