Can you fold it easily? There may be some families that never fold their strollers. But most parents need to fold them to get them into the car, if not into the house. If you have to wrestle the stroller to the floor, that's not an easy fold. If the stroller doesn't lock in it's folded position, but instead springs back open at the slightest provocation, that's not good either. And sometimes it's just too hard to remember which buttons, latches, and bars you use to fold some models. Test before you buy, and choose one that's easy.
Important Questions! Here are some questions to ask yourself as you check out strollers in the store: Is the handlebar high enough? Take a few strollers for a test push. The most annoying thing when you're out for a walk is pushing a stroller with handles so low that you have to stoop, or so short that you kick the back of the stroller. Look for handles that fit your height and your gait.