I got one of these a couple of months ago, I used about half the amount of bran I was supposed to for the time it took to fill the bin (3 weeks or so- it seemed to compact down amazingly well, was very surprised at how much went in before it filled up).

After leaving the full bin for a couple of weeks there's white mould like there's supposed to be.Haven't done anything with the contents yet, but will have to tomorrow as my other one's just filled up.

Got plenty of juice too, which has seemed to be responsible for the complete recovery of my weak lemon balm (just removed mildewed leaves, added juice & it's double in size already!)

Quite impressed with the system so far, interesting to see how it deals with smells/flies when things warm up a bit . . .