Cons: Noisy and scared my cats
I wanted this product to work. Neither of my cats like having their nails clipped. I thought perhaps a grinding tool like this one might do the trick and make the process easier for everyone. It didn't work out that way.
First, the unit is somewhat noisy. The manual explains the process to introduce your cat to the product and the sound it generates. I followed the directions. Still, my cats hated the sound. They fought whenever I turned the trimmer on. I tried reintroducing several times with minimal luck.
Second, I found the trimmer less effective than conventional clippers. Perhaps if my cats had warmed up to the sound and not pulled away so frequently, I might have found it more effective. I ended up tossing the trimmer in the trash.