I've owned one for a year and used it in Wyoming with no issues. I will be taking it to Alaska this fall and we'll see how it does up there. So far I'm quite happy with it. It's lightweight and the batteries seem to last quite a while. I'd recommend it over the iridium.
I've used both cuben fiber and granite gear uberlight w/event bottom and prefer the latter as you can push the excess air out of the bag. Makes the perfect compressible sleeping bag sack that I've found...