Have used for my toes and it is easy to use with different tools to adapt and do the job your wanting done.
I bought this because I'm getting old and stiff and it's gotten progressively harder to trim my toe nails. This device has a good selection of replaceable heads and works surprisingly fast. It's also good for grinding down callouses and rough spots. It has a USB Standard-A to USB-C wire that works well enough and can be plugged into a wall socket with a USB port or, I suppose, into a computer. It takes a while to recharge but not overly long. Generally worth the investment.
My problem toenails have never looked better after using this tool for well over a month. I rated a 4 because I just wish it had a little more power to it. With that said, it is an improvement over the salon pedicures I was getting. This tool provides attachments to work with problem toenails that salons will never take the time to use.