I used one at the T. G. & Y. I worked at in HS. After snipping, we would straighten out on the table for cutting, or some ladies preferred the ripping.
Beaware, it only comes out of the machine as straight and true as it comes off the bolt from the maunfactureres.
When we measured eeons ago, we were instructed to add an inch to inch and a half more before pulling through the machine. I alway's wondered who paid for this extra measurement of fabric especially if you had 10 women buy from the same bolt. That was an extra almost foot of fabric the store was giving away. Made me wonder...