I would use it if given to me, but slab protection seems excessive, I wouldn't scratch a slab doing anything I do with them (hold them, pick them up, look at them, put them down) but if it was a super high value coin or I was given some for free, I would use them.
The coin shop by my house sells pages that are pretty much slab protectors, they work sort of like 2x2s so you can keep them in your binder. I beleive they are made by Lighthouse. I only have one but its in a ziplock bag. ~Corbyn