Even for night use, I don't consider a PB superflash to be sufficient in all situations. Yes, it's OK on clear, dark nights with no distracting lights in the area. More than enough in those situations.

However, add in heavy rain, dense fog, or ride through a city with lots of lights all over, and I for one need more. I used to use a Dinotte 140 but I now use a Magicshine taillight. Given that I already had a Magicshine headlight anyway, for $29 the MS tail was a no-brainer. As far as I can tell, it has exactly the same emitter as the Dinotte 140R.