I have used this only once on my nails, but I am so pleased with it I am happy to write a review. My nails are naturally very shiny, and I always struggle with nail polish as it wears off after only a day or two of wearing. My friend recently used one of these blocks to buff my nails before painting and the result was brilliant. My nail varnish lasted 3-4 days rather than the 1-2 it would usually. I appreciate some may want even longer wear but for me 3-4 days is brilliant as I get bored of the colour quickly and like to change it regularly. Since using my friend's block, I have purchased this one and used it once, and again the same result, my polish is only now beginning to wear off after 4 days' wear. It is perfect for gently buffing the shine to create a surface to put nail polish on. The only reason I haven't given 5 stars is because I've only used it once, so I don't know how it will hold up over time and many uses. Though to be fair, even if it does wear out quickly, I wouldn't mind and I would repurchase, the price is so reasonable.