Recs.
Updated
This distro, based on the Ubuntu LTS with a custom desktop environment called Pantheon, is a turnkey OS with a focus on user experience design and system efficiency.
SpecsUpdate
Pros
Pro Ubuntu guides can be used
As this is based on ubuntu. Most ubuntu guides work with elementary. Try using this guide.
Pro Consistent development practices
All Elementary apps are written in Vala and hosted on Launchpad, and there are standard APIs such as contractor for applications to interact with one another. This is different from most distros, in which apps are written in a variety of languages. This design decision makes it easy to get started developing for Elementary and to understand how the various pieces fit together.
Cons
Con Very slow development cycle
Elementary does not offer any release date for their stable releases going more with an "it's done when it's done" attitude. Making depending on newer apps a difficulty as well as a poor choice for those that need consistent release schedules for their OS.
Con Window control button placement may be unintuitive to some
Elementary OS has window controls on the left side of the window. It may be less intuitive to users coming from other operating systems that put window controls on the right.
Recommendations
Comments
Flagged Pros + Cons
Pro Cannot find a Con
I can't simply find anything wrong with this Pantheon/Fedora Mix
Out of Date Pros + Cons
Pro Active Google+ community
There is a place where elementary users can ask their questions and usually get answers pretty quickly. Not only by the other users, but the devs are pretty active themselves, often engaging in the discussions on the hows, whys, and plans for the OS.