I have the Serra Alpha, which is the same as the omega, but for 3 people. The sierra is more versitile than other tents, and I have used it for a few backpacking outtings, and many family outings. It is nice to be able to remove the inner panels, and the extra pole sections, which saves considerable weight. I have not had the tent loaded with snow, but it has been through torential rain. It did leak a little on the base, but only because water was pooling between the tent and the ground sheet. The tent has excellent ventilation, and is superb for star gazing, as the entire top hood zips back. I have used the tent down to 20 degrees and found it to be comfortable at these temps.
What impressed me most about the sierra tent was the quality of workmanship. All of the stitches are double stitched, with quality thread. This tent was obviously designed with attention to detail.
-percious