Does anyone here use Pet Protector disc? Is it effective?

The advertisements for this product is plastered in almost all of the pet blogs I've been to, even here. It's simply a pendant that you attach to your pet's collar and it will repel ticks and fleas for two to fours years.

I've been posting about my Clio's battle with tick infestation. I can continue bathing her with guava water to heal her wounds but I hate seeing her scratch and scratch in discomfort because ticks just won't leave her alone. I'm afraid it's just causing her so much stress.

I've seen the website and the price of the product. I haven't got the money now but if it's effective, I'll save for it for Clio's sake.

Any reviews?