I was a bit dubious about spending £9 more that I would normally for a nail file, but got it this morning and literally less that 5 minutes later my nails were done! It shapes gently and super quickly and if you cannot file the way that manicurists do then it doesn't matter, you can do it back and forward with this file. Its not heavy or cumbersome and comes in its own protective case, which you will need.
Don't drop it, that would be sacrilegious! Do though, buy one!