What else do you need in a o degree bag? This bag has held up well with extended use, with minimal feather loss. The shell material has held its DWR coating and sheds morning condensation remarkably well. It's worth buying a waterproof eVent dry-compression stuff sack to get this bag to its smallest, and with that it can get remarkably small for a zero degree bag.
Pluses -- Light, accurate warmth rating (compared with other brands, it feels about right), quality construction
Minuses -- It's expensive, but the price is certainly within reason compared with other brands of this quality.