I bought a 24" slide lock several years ago at a quilt show, (before the price got so high), and enjoyed using it.
For about 6 months.
Then, hubby claimed it for himself. He loves using it with one of my 24" rulers that he also claimed, to cut foam board. He's a photographer who uses lots of foam board to mount his photos before framing them.
Truthfully, he uses it more than I ever did.