I don't like treadmills. Never have, never will. If it's too cold out to run, I don't run. It takes a pretty cold day though to stop me from running. Going to the gym to run on a treadmill isn't an option even on those super cold days. Now that the weather is consistently above freezing, running outside is the only option.
My sister is a runner. She has a treadmill and swears by it. Softer on the knees and hips she says. She gets to watch TV while running on her treadmill. She says I should try it. After you look at these epic treadmill fails you'll understand why I really don't like treadmills.