This post is from Brothers in Battle and has some great information in it about the reality of working and climbing angles.  The thing we like the best is that there are pictures with degrees on real buildings in real conditions.  Thanks to BiB for allowing us to share their information here on this page.  Check out their webpage at www.brothersinbattlellc.com for lots of great resources and a podcast as well.

Article link:  43 Degrees of Separation-BiB