I had an issue with my order but the seller made it right immediately so I'm very happy with the seller.The blade fits and works in my machine, but is not an exact duplicate of the original blade that came with my Ninja Professional 1000 Watts unit.These are a few of the differences I noted:1. It doesn't seat into the base quite as easily as the original, you do have to push harder to activate the blade.2. There was an odd 'burnt' smell upon the first use, didn't smell it upon subsequent uses.3. The most important difference I noticed was the difference in the blades. I've attached an image that shows the new blade (Left) and my original (Right). The original blades are longer, wider, shaped slightly different, and definitely sharper but for my needs mostly making smoothies and shakes, it works well.4. The last difference I noted is how loud it is compared to the original, not sure why but it's really loud.Note: I haven't yet tried including ice cubes to see if it handles them as well as the original blade did but if I get the chance I will update my review.