I`ve never tried one but it looks OK.
I find it amazing that people attempt to swap batteries (or even straps) without using some type of magnifier. Even with good eyesight it makes the job easier, although learning to work through a magnifier of any sort is an acquired skill. I use a clip-on loupe for my work glasses and various strengths of glass held in the eye socket for the really tricky stuff. That doesn`t suit everyone but it's second nature to me.
Eyeglasses and loupes can be bought cheaply from Cousins, they're so useful for inspecting stuff too. Makes more sense than spending a lot on fancy strap-changing tools IMO......ideal answer is to have both.
Paul