It's hard to park a TARDIS. Despite it being so small out the outside, it still has a footprint and can easily squish things if you're not careful. We think this is why people like River and Captain Jack have alternate means of getting where they need to go.
We've been told that exactly ONE of these Designer TARDIS Watches has time-traveling abilities. Since they're all sealed up in boxes and it would be rude to open them all, we figured we'd just let you try your luck and see if you get the one with the power. If you do, we recommend the following: killing Hitler, buying Apple stock, leaking the endings of BSG & LOST on the internet (during say, season 2?), and betting on the underdog in important sportsball games. And to think, you'll do it all while wearing a handsome TARDIS-blue watch!