Right now plugin is in early beta stage. Main purpose is to export to Thea studio, so no RR support.
Best bet is to try it, download demo versions from their site
http://www.thearender.com/.
Features/Changes, for latest version:
The Thea Render options are now synced with revision 571 of Thea Studio, with the exception of the Location drop down in the physical sky section.
Support for phong and lambert mental ray materials/shaders for now.
Point lights and Spot lights supported. Area Lights are a work in progress.
Multiple camera types.
Only polymesh geometry are supported currently. Geometry Approximation is now supported, please set the render level for the appropriate result in Thea Studio
One UV projection only
Starting of Thea Render after export
Licensing has been added and is required to export scenes
Binary Meshes are now supported. Multiple material or cluster material support is still in progress
Editing of Thea materials using Thea in matlab mode has been added
Animation support for models, lights, and cameras. New 'Export Animation' option on the 'Animation' Tab in the 'Render Options' property
Added 'Units' drop down to 'Output' tab in the 'Render Options' property, added support for centimeters
Demo version restriction changed to stop at 50 polygon meshes
Various bug fixes