Coffee machines with built-in grinders offer convenience by integrating grinding and brewing into one device. However, the quality of the grinders in these machines often doesn't match that of standalone grinders. Generally, integrated grinders may not provide the same level of precision or consistency in grind size, which can affect the taste and quality of the espresso produced. For those serious about their coffee, investing in a separate high-quality grinder might be a better option to achieve the best results.