Standalone Hard Drive Duplicator & SD
 

SuperDuper is certainly the best way to clone a hard drive, and I've used it constantly for years. But I'm considering how to simplify things and avoid using/tying up my computer for more routine duplication.
I have a self full of full hard drives (video files) and want to move all the data once a year to insure the continued health of the HD.

Has anyone used a standalone HD duplicator like the ones copied below?

How does it compare to SuperDuper? Reliability?

USB to SATA Standalone Hard Drive Duplicator Dock (SATDOCK22R)
http://tinyurl.com/6thukfp
SATA Hard Drive HDD Duplicator Dock - eSATA USB (SATDOCK22RE)
http://tinyurl.com/7vffc5p

I have no experience with standalone duplicators, sorry.