i just got this from woot.com! cost me $55 with shipping
original price online is $150!..what a saving..but i have to buy replacements every month or so.
Im not sure how well this thing works, but i heard only good reviews.

the replacement cost like $20 online…so hmm i’ll review it when i use it later!

update: i’ve tried it…theres 8 different programs. I some of them really hits the spot…the power level is up to 8…not quite powerful…and im sure that drains the battery very quickly..there is also a timer on it…basically i felt that the shocking was like massaging and numbing my lower back…after taking it off my back felt numb so obviously i don’t feel any pain, thats the objective…so i definitely think its a good device…

is it worth $149.99? no…
is it worth $55 with shipping? yes…

I made a good choice on it. Now whenever I feel pain i can just stick this thing on.

However one major con about this is that its not easy putting it on properly on the exact spot…the 4 adhesives sticks to your back rather than to the belt itself…so when you put it on and you mispositioned it then you have to redo it until you get it right.