I had never considered sifting ingredients necessary in the past but wanted to give it a try while adding measurements by weight to my baking practice.  I have used this attachment a few times so far and have been happy with the overall functionality and results.  Sifting can make a difference and weighing out the ingredients has provided more accurate results.  The unit is slightly noisy as the metal bars scrape against the screen to sift but not much more than the mixer itself.  I would have liked to see an option to shut off the sifter when not in use but still attached to the unit.  The grams do not measure to tenths so I still  have to use measuring spoons for smaller items.  Overall, I am happy with the product.