It feels good, but it's pricey.
I dunno that it helps with much other than some tight muscles perhaps...
in which case I would suggest one of these rather....
http://www.amazon.com/s/ref=nb_sb_ss_i_0_7?url=search-alias%3Dhpc&field-keywords=dual+tapper&sprefix=dual+ta%2Chpc%2C158
I got one for a shoulder injury - but it's freaking great for quads and other large muscles.
It has a set of covers with knobs that is shiatsu like.
Plus you can use it after you get out of a hot bath and the muscles are relaxed.
Serously....I would suggest that instead.
Oh, and no, the more expensive ones aren't any better.
Really.