The faster a new user reaches the "aha moment" of seeing value from your product, the more likely you'll retain them as customers. Also, if you can automate the walk through and training, that's less time and money on support. And that's why I love LOU. It makes it easy to add interactive welcomes, walk throughs, and announcements. And it doesn't take too many eliminated support tickets to pay for itself.
So, pick it up, you'll be glad you didn't miss this one.