I won't leave the pavement without one. Vital piece of rescue/recovery gear IMHO.
I couldn't agree more. They can (and I have) be used for many things from lifting a vehicle over a rock, winching over a dead fall tree and re-seating a tire bead.
A word of advise; at least once a year grease the parts on the lifting mechinism. Then it will last you a life-time.