Since I snagged a spare wheelset on eBay, I don't know how I got along without it.

Time comes and you just want to GO. Grab the Bike and something's wrong. Tire is a little soft or whatEVAR. Might be tempted to give it a quick pump or run for it and take your chances. With the wheelset, you throw the matching wheel on your back or mount it right there and GO.