Welcome to the Quilting Board!

yes, they are made so that the bottom blade doesn't constantly catch the bat as you cut. They are on my wish list.
I had to laugh, even though I basically Feline Fanatic,pulling the bat from the bolt below my table and up over the pick up roller and using the cutting table to cut off the bat. But have to say that I've learned to measure more than twice before cutting, the hard way!
Since I use several different types of batting, I have all my rolls stored in a closet. I pin my backing onto my longarm, lay the roll of batting on the right side and roll the batting across the backing until I come to the end of it, then cut it off with scissors. Very easy and I've never had a problem with using the factory-cut edge on the top (I float the bottom of the batting in a batting sling made with an old sheet to keep it off the floor).
Proud mom of a daughter in the Army
http://farmquilter.blogspot.com
http://www.facebook.com/#!/profile.p...00001741707981
Jude, your batting does not have to be square though in a perfect world it certainly would be. It Just has to be large enough for your quilt. and can be a perfect circle as long as it is large enough to completely cover your quilt.