I have the 2008 model (blue one). I've used it down to -14c and although I was warm enough to sleep (I'm a cold sleeper) it could have been warmer. On that night I used a homemade fleece liner and was wearing fleece pants, wool socks, and wool sweater. My downfall was that I wasn't using a very good sleeping pad, if I was I'm sure I would have been able to sleep at way colder temps.
With all winter camping you need to have a really good pad or your bag will not keep you as warm as you like.
The drawstring around the chest and hood are really good at keeping the warmth in. It is very spacious around the chest and allowed good movement (I toss and turn a lot), a little tight in the knees but still ok. The material is soft and comfy to the touch and really invites you to doze off. The zipper needs to be guided most of the way as its not the smoothest action I would like.
You will need a compression bag, it doesn't come with one (at least 2008 didn't). Without a compression bag the only option is to lash it on outside somewhere cause its BIG. Its also a little heavy but at this price you have to give up something.

I set this up in the backyard for a couple of days so I could practice using it before taking it out in the bush/trail. I used this in the atlantic winter storm (cape breton, ns) on Dec 20-22 2008. We got roughly 15-20cm of snow/ice with sustained winds of 50-80kmh and gusts up to 120kmh, it performed quite well. This is a comfortable one man or cozy two man tent. If you don't use the vents properly you will get condensation. The last tent I used was like 20 years ago and they have changed quite a bit since so this only gets 4 stars due to my lack of experience with other newer tents. Overall I slept really well despite temps. ranging from -1c to -12c and extreame wind with blowing snow/ice. The fly didn't "flap" in the wind and keep me awake, I made sure it was quite taut and everything was fine. When even a little bit of light hits the fly, the interior starts to really "glow" and brighten things up.
The seams are all factory sealed and the stitching is tight, nothing leaked. Get the floor saver, it's cheaper than buying a new tent. I haven't used this in the field yet but overall the quality is pretty good and I don't anticipate any problems.

It came with 15 7" lightweight alum. "J" pegs, 10 7' ish guy lines with tightners, pole bag, and stake bag. You will need to get some more pegs to fully guyout the fly. The one's that came with it are not durable enough for me and bend easy when staking in rocky ground. Oh yeah it's not really yellow (rain fly) it is a bright almost flourescent orange, you won't lose it in the field that's for sure.

Things I like:
Super easy set-up.
Withstood 120kmh wind gusts without moving.
Sheds snow and ice pretty well.
Great ventilation.
Tons of extra guyout loops.
Decent weight, not heavy but not ultralight either.
Looks cool.

Things I don't like:
Zipper on vestibule is too close to velcro fly attachment and gets a little stuck sometimes.
The middle pole (not the backbone) hovers above the backbone and creates a half inch gap between the two poles, almost like the middle pole is too big (or maybe its just my setup), I wrapped a piece of velcro around both pieces, pulling them together, works good and makes it more solid.
Rear vestibule, kinda usless.