I have been so satisfied with the Polar Berk, that I wanted a C & O Berk as well, but they sold out so quickly, I couldn't get one. I had a Northern that I was going to convert to DCC, but after running the Flyerchief Berk decided it was a waste of time, money and effort, as the Flyerchief will run on AC, DC and DCC. I love the flexibility.
The word I have heard, so far, is that they are due this month, any updates?