Effective, does the job. Fair bit of ground coffee gets hung up in the machine and needs to be taken out so as not to let it sit until the machine is next used. Not a real issue or criticism, just something we have learned from. Wasn't as messy as I expected it to be given other reviews I had read, though I was grinding into a container and not a handle for direct insertion into an espresso machine. I can see this would likely result in coffee grinds strewn far and wide.