Mike O'Toolewrote a review of Kuat NV Core-2 Bike Rack - Hitch Mount on July 14, 2012
Got this rack after using a friend's NV model (slight upgrade from the NV Core). Very solid rack and is surprisingly light.
I would have gone for the NV if I was looking to get the extension to make it a 4-bike rack, but the NV core is perfect if just looking for the 2-bike rack.
Definitely advise getting the locking cables, which were really easy to install.