They let you “buy” specialty equipment, like cable tensioners, heavy duty bolt cutters, and other things you’d only ever use one time. And then as long as you return them within a year they’ll give you a 100% refund. Assuming that’s not a scam (I’ll be finding out) it’s brilliant. I bought most of my stuff through them because it essentially came with free (minus shipping back) rental of some really random specialty tools. Got me to pick them over all the others.