We've been using timeindex for many years now, and have never had any problems. It's easy to use, and I highly recommend it! Nothing really. The interface is very intuitive and user friendly. There are some minor issues with the notifications system when you're away from your computer. But this has nothing to do with the product itself. If you're looking for a good scheduler, look no further. We're able to schedule our employees at all times of the day, and we can easily send out reminders to them if they need to be somewhere or at someone's house.