I've got the eno single and have had the New River for a couple months now. It's kept me toasty warm down to 20 and it's well constructed and a great value. I admit, it does not pack down as small as I like, but I still have no problem packing for a couple days with my REI flash62. And that includes a down bag for a TQ. Once I get a proper topquilt, I know I'll save some weight and space too. Taking it on a 5 day trip in June, so we'll see how it goes.
Whenever I buy something, I always keep looking out for that next purchase. When funds allow, I'll go with down for it's packablility. The key is just getting out there and enjoying it!