An interesting system that would be interesting to try. I think they need to make a cover for it though. Make it from the silicone used elsewhere in the Bruer and design it to seal against the inside with a raised handle in the middle both to grab and to clear the drip rate adjusting shaft when/if used in the upper chamber. It should fit both the upper and lower chamber. While it may only get used in the upper chamber for storage it will be used all the time in the lower one when storing the brew in the fridge.
They'll have to be careful of their price point once it hits retail. Competition is starting to heat up in this area.
Java "CP, the nectar of the Gods!" phile