The 2012 Specialized Shiv was built for a certain type of rider. If that's you, it won't disappoint.
My gripes aside, the Shiv is a great bike. It represents a very refined aerodynamic design, but holds on to as much end-user convenience as possible. Ultimately, the potential purchaser will want to know two things. First, of course, is whether the bike fits. And if so, whether you'll be able to use the S-Works bar, or if you'd need to source a lower-stack option.
Second, it's critical to understand what the Shiv's design philosophy is, and whether that jives with what the you're for. This bike's frontal profile isn't as clean as its nosecone-bearing predecessor. But it's a whole lot easier to put together and service. That can make a big difference if you travel to multiple races each year and just don't want to deal with it.
Specialized has put together a very impressive package, and is doing a solid job of advancing the triathlon bike as its own unique entity. If the Shiv makes the list of bikes that fit you, it's a compelling choice.