Never used this model, but my girlfriend and I got pairs of the boundary shoes back in March for an 8 day San Juan Duckie trip...couldn't have done it without them. They kept us warm beyond our expectations. they are a bit bulky but paired with the boundary socks underneath they have been awesome for us.
I would assume that this product is also bomber...hope to hear more about this exact product from others, but it has been my experience that NRS makes a great product. I don't know about with these, but with the boundary shoes they test each pair for waterproof-ness before sales...pretty cool.