I was afraid to use this because I purchased a similar product from one of my favorite TV shopping networks and it left my nails thin, brittle & very weak. I realize, I personally cannot use every new hip product that comes out. I need something that’s practical, actually works, cost effective and more importantly healthy for all nail types. I like the fact that it had a sharper end to it where I can get under the nails and clean them properly. To be honest I’m still in shell shock about this type of glass product and my experience from a similar product, so to be fair I gave it a 4 star because I love the sharper end & it works. I haven’t used the glass, but I purchased it for the sharp point. I believe this product will be good for potential buyers.