A group of people are about to start an open source flightsim and discussion turned towards 3D APIs. Cross platform compatability is desirable so that pretty much rules out DirectX. However a DirectX supporter suggested using OGRE and it is being considered ( http://ogre.sourceforge.net ).
Personally, I'm sceptical since OGRE is an API on top of an API and a loss of flexibility is certain. If it were up to me, we would go with OpenGL.
Has anyone experimented with OGRE, and if so could you touch on the pros and cons of using it in a project.