So, I just replaced my flagging MS900 by treating myself to a new dynohub (Alfine) and lighting setup, namely the Supernova E3 Pro with the compatible tail light.
I decided on this setup after doing quite a bit of online research, and am very impressed with the overall build quality and the level of illumination. It is quite comparable to my magicshine, with less of a hotspot issue - better overall, IMO.
However, after only a few miles, I noticed my standlight and my tail light were not working. After some more research, I learned that the internal standlight capacitor (which provides 5 minutes of light while stopped) also powers the tail light. I have drawn the conclusion that my light was shipped with a faulty capacitor, and am working on getting a warranty replacement.
Has anyone else run into this problem?