Well, 9to5 Mac isn’t into a $259 Smartphone receipt printer, but do note that it might have it’s uses:
I am not feeling it, but I imagine there will be some special use cases. As The Verge notes in an interview with Berg cofounder Matt Webb, you could put one of these at your grandma’s house and just send her black and white notes/receipts all day. You can even have it set up to print news on a smartphone-sized scroll of paper. :/
We covered this here on ufies last November, where I was excited about it (as I get with new things) but it was before we knew the price.