Great find!
I'm giving these only a 4 star right now, as I have only used them once so far.  Having taken on the task of doing my own nails the past year I have tried a few options.  So far, I have found these to be the easiest to use, there are many size options for the optimum fit, and for me, the curvature is a bit flatter which for me is far better.  It's been 2 weeks, and I have had to re-do 2 of them, but I believe that to be a learning curve and the fault lies with me.  I can see me revising this to 5 stars in the future once I've better mastered them.  They are super easy to use and require minimum filing and shaping, and I have shortened them considerably for my use.
Rating: 4 stars