"It's a spice chopper that pulverizes coffee beans, not a proper grinder."
The 'Stainless Steel Blades' chop beans chaotically. Unlike a burr grinder that crushes beans to a uniform size, this device creates a powder-and-boulder mix that makes a bitter, unbalanced cup of coffee.
This product works for grinding spices, where particle uniformity is less critical. It's also an option for someone who absolutely must have freshly ground beans for under $25 and is using a basic drip machine where the flaws are less noticeable.
Anyone serious about the taste of their coffee should skip this. A manual burr grinder costs only slightly more and provides vastly superior grind consistency, which is the single most important variable for good coffee.