This thread is a great example of why I prefer to invest in my current city rather than OOS.
There is always unique factors that affect every market that OOS buyers just won't be privy too; sure, an agent can be a wealth of knowledge (ours is), but there is still something said for knowing the area well.
I find some of the posts from OOS folks on Huntsville interesting, because it shows how little they truly know the market here. Everyone assumes that houses in 35801 are fabulous due to various websites and experts on the area - there are some parts of 35801 you absolutely have to stay away from, and some parts that the rent changes by $200 to 300/month by simply moving one street over. But that knowledge can't be gleamed from simply reading about the city or rentometer; if your agent works mostly in suburb properties, they may not know these nuances as well. You just can't replace first hand knowledge of the location you are investing in.