Fantastic grinder but the hopper leaves some to be desired. I decided to get rid of it for a single dose modification as seen in the picture. With this setup (including a spray of water) I'm getting between 0 and .2g of retention after seasoning the burrs and filling the gaps through regular usage. It can be a bit messy (use a pf funnel) but it grinds fast. I only use it for espresso. I like it better than the actual single dose version because of the screen and power button. I like being able to tap the on button with the portafilter instead of having to press a switch on the side for on/off. Great grinder...4 stars