Vincent Laforet wrote an interesting blog post, with a little video of everyone's cameras. 

http://blog.vincentlaforet.com/2008/09/04/remote-heaven-or-hell-depending-on-the-results/

And wow, pocket wizard sure has a monopoly.  They do work great so no complaints, but surprising that no one else has stepped in to try and compete. Maybe they have a patent on radio control remote controls for DSLR cameras.

yeah, i guess when i think about it they do!!... but they really don't compare.  I used a hensel radio remote unit for hensel strobes and it would misfire much too often.  The pocket wizards have never misfired unless there is a bad cord or something.

but still surprising there are no, at least 'equal' competitors.