Almost all slides have a manual crank for retraction if the motor goes bad.
Make sure you know how to operate it manually before you need to. Crawl under and operate the manual crank while it is in your driveway. Better to figure out how to do it before you need to crawl in the mud, in the dark, with flashlight in one hand while DW is reading the instructions to you...
Watch out for trees, fences, pedestals etc while positioning the rig in a site. I know mine extends 42 inches. I carry a tape measure in the glove box to check clearances.
While retracting, check for anything getting trapped between the slide and main wall.
OTOH under the slide is a dandy spot to stash large items in your campsite. Out of the way and out of the rain.
