There is a BIG difference between the performance of standard and precision baskets. Particles will always come at different sizes, this is partly how an espresso gets its flavour. Small particles can get through the holes in your basket, creating a rich coffee, but large coffee particles can clog the holes in your basket. Standard filter baskets are more likely to have jagged and uneven around the holes, causing more clogging. Precision baskets are designed to have smooth, perfectly circular holes that reduce clogging and improve flavour!