Well, there are two types of cyclocross bikes: race only bikes, and bikes that are more all around sporty race like bikes. One thing that stands out on the sporty bikes is rack mounts – a real race design will never have these.
Specialized tri-cross is a decent bike if you are not really racing (the Crux is for that). One thing for sure, they really hold their value well as they go really quickly and for top dollar on Craig’s list. The Jake the Snake also goes fast as a used bike.