Well made and easy to use. The brushes that come with the unit are great for indoor sweeping. Buy the "Wet" brushes for outside work. Excellent product!
The S4 Twin makes it easy to sweep a large area of small debris and dirt. Like a broom, it does not pick up 100% of fine dust and dirt. And like a broom, it does kick up some dust into the air if there is a lot of fine dust/dirt, such as can be found on a garage floor. I like the side brushes to get the debris that is against a wall. I always wear an N95 mask when using the S4 on a large interior commercial garage. In 20 minutes I can sweep up what used to take several hours with a broom. Every few passes I lift the storage bucket to move the debris to the back of the bucket, which prevents the older debris from staying in close contact with the main brush. The S4 is not a substitute for a vacuum cleaner but if you're using the S4 on a dusty area, a vacuum filter would get clogged very quickly, so the S4 is actually better, as long as you are okay with collecting only 80% of the dust.
The perfect answer for our matted dog trial ring! It quickly and easily collects dog hair and dirt from the show ring area in 1/3 the time it took to broom sweep!