I don't have that size but love my slotted ruler. I use it when cutting strips and then cutting them down to another size. Makes life so easy. Just got done cutting tons of strips 4.5 and then down again to 4.5 the other way. So much easier to me than to take a regular long ruler and hope you cut on the correct marking ...............which I've goofed up numerous times in the past. This is one of the reasons why I like to use the slotted ruler.
I do need to replace mine as I've nicked mine plus I picked it up incorrectly so one corner snapped on me. Had to tape it back together and its been like that for a couple years now. Just waiting for a time when I have the money and its on sale. Want to get the larger size next time too.