I have used some that I got from a pal who has a few hundred feet as a 5" wide roll.
It works fine optically exposing it. A bit faster than normal MG, as others have noted. More like some old Oriental I use once in a while
I cut it to 4x5, and used it for copntact prints of 4x5 negs, and used the last of it up on a postcard exchange mailing.
The only drag with roll cut paper is the curl.