Dennis Miller said it best:
"Two of sh!t is sh!t... if the really wanted to fcuk you they'd offer 3!"
There is a more pertinent question that can be asked about your usage and room size.

If you are trying to get low output for movies, the the RSL may be challenged... Same with being used in a very large room.
However, it is a very good and respected product that reviews well.
I have never heard a redeeming quality spoken or written about a B&W Sub.