If you are interested in "intellectualism", then you certainly wouldn't be signing up with XM! Intellectualize on this! Sirius uses "S-plex technology", with 3 high-flying birds that run a figure-8 pattern. Sirius "satellite structure" is much more "well-though-out", complicated, and "intellectual", than XM's geostationary orbit; and Sirius is able to reach more northely lattitudes, with better reception "on the ground"! If you're into "intellectual law", chew on this: http://www.law.suffolk.edu/stuservices/jhtl/V1N1/DERSKINEV1N1N.pdf
And you might also care to know that Wisdom Radio, on Sirius stream 132, has some of the most "leading-edge", philosopher/physicist/meta-physicist lecturers and teachers in the world, showcased on this "exclusive stream". Sirius Satellite Radio is "intellectualism's" greatest ally, not XFM!