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Was actually a supernova front light, but yes, it caused it to flicker unless i unscrewed the cable connector thing, which was a bit annoying. Whereas d1 detects if something is plugged in to the usb and doesn't draw power otherwise.
However i have mixed feelings about whethwe d1 is that much of an improvement. The Werk is a neater unit once you consider all the extra bits coming off the new version of the Igaro and my D1 is about to go back to have the USB plug changed as the charging has become unreliable (it did this on LEL which was a pain). The screw in plug on the Werk is possibly better in that respect. I believe Igaro charges more efficiently compared to other chargers according to the website, but that's hard to judge.
Basically they're both pretty good.
I've got a USB Werk, its been used for a year with no issues whatsoever. I can generally finish long rides with both my phone and Garmin fully charged. I bought it over a Igaro as you can put it inside a frame bag and it wont overheat, whereas Igaro recommend not to do this.
I know @ad441 had some issues when using one with a Son front light where it would draw power from the light beam whether it was being used to charge or not and he would have to disconnect it.
I've never had that issue using B&M Luxos front and rear lights with mine.