Review (3/5): Good enough for beginners
Obviously I am not a nail pro from the picture I attached, but I think the tool did a good enough job filing the nails into a narrow shape. Others have said it doesn't have a lot of power and it's true - if you want power, buy a Dremel if you want to shave your whole finger off. However, I think it has enough power to give you control of the tool without it flying out of your hands.
PROS: lightweight, quiet, RPM isn't crazy high
CONS: the off/on switch is on the cord and makes it too cumbersome to reach it (wish it was on the tool), it's easy to put the drill bits in since you just shove it in but it's super hard to remove them when you're pulling them out especially when you have long nails and have bad hand strength, the extra tools included are crudely sharp and feel like they weren't given a nice finish (it feels like any of the edges can slice your skin off)