We've been playing around with it for the last few days and have been very impressed with the mobile instant messaging solution. To refresh, Kik messenger is a proprietary IM service designed for mobile use, is available on the iPhone and Android, boasts over 4 million users and is completely free.
So why use it over something like IM+ (see video tour)? In our mind it's simple: Kik is much faster to load, use and more importantly send/receive messages. It's the closest thing to BlackBerry Messenger (BBM) with its Sent, Delivered and Received statuses. From our experience, it's the most reliable and fastest IM client we have used yet on a mobile device: with push notifications (Live Tile, Toast), messages are received in less than 10 seconds nearly every time--truly a great experience. Sure, it's not a multi-client system like IM+ and means you would have to try and get your friends on it, but so far we think it's worth it for mobile use, especially for communicating with those internationally. It's also $10 cheaper i.e. free.
Watch our video tour and then give the app a spin yourself and let us know what you think. You can grab Kik right here in the Marketplace. (Thanks, Mike A., for the tip)