...For a piece of mind, the prismo is a safe gadget to use in comparison to future aeropress spills from using the inversion method. The prismo is very high-quality and engineered well. The metal filter is very fine and I don't find any grounds in my coffee. The result, even if not an outright espresso, is a richer, deeper, more concentrated cup of coffee. I recommend this product. Cleanup is also easy.