When vacuuming but you should make sure that the pieces are not too big and edgy, as (purely from the logic out) pieces that are longer on either side, as the tube is wide, tilt up. What a surprise: You should first sweep, and only absorb the annoying little stuff.
If I buy such a sucker, I do not want to work with a bag on the building site. Therefore equal to full throttle. It worked great. Super suction result. All gone.
I then connected the suction and a mini circular saw to cut a slot. Again, I can only say good.
What made me not so convinced, is the filter-cleaning function. I've tried it, but the filter was still very added what I was able to compensate by turning away. However, the suction was actually not yet declined. Perhaps, therefore, lacked the "back pressure" ...
So, since he has always worked flawlessly, I look across the filter clean and give all 5 stars.
