Great tents (!), but they are overly spendy and not as light as some out there, especially for the kwan that TN demands...
Check out the Rab mountain biv if you can find one as a cheaper, lighter, and at-least-as-durable alternative.
Also...Tough to beat a Big Agnes Flycreek at 2 lb 2oz (2 man) for around $200 on Ebay..or a the 3 lb 10 oz (3 man!!)...those are incredible figures for durable tents.