Bought One 3metre length of this spiral ducting for a kitchen cooker hood vent replacement for aluminum flexible ducting that had been holed. The product was delivered on time and as expected in good condition with only one small pea sized dent discovered only before cutting the ducting to size.
I found the spiral ducting to be well made with a good finish, a quality item for the price.
For others trying to manually cut this type of ducting square, a technique I used was to fit a suitable circular metal hose clip onto the spiral ducting making sure the clip was fitted square on the ducting to use as guide for cutting, making cuts with a hacksaw and rotating the ducting when the saw broke through the metal and repeating the procedure until the ducting was fully cut through. Be sure to remove any cutting burrs internally and externally with a file after cutting the ducting.
Hope this review and comments others may find useful.