MH Viperine 2/3 Info???

Hi,

I am in the market for a new tent. Currently I am looking at a few and right now my favorite is the Mountain Hardwear Viperine 3. I was wondering if anyone out there has had any experience with the 2 or 3 person models.

I typically camp with another person and often a 70 lb dog, so I prefer the 3 person model. Also, I do a lot of backpacking, so a relatively light tent is important. Right now I live in NM, but may be headed to the east coast soon. Any info, suggestions, or comments would be great!