Been using Plans for years, on various websites.
It's a simple, easy-to-use, calendar. It's a breeze to install and works right out of the box. Customization is easy. I have tried many other calendar programs, some with less features, some with more. I always come back to Plans for reliability. It's user-friendliness is a plus for my staff who like to do things quickly. And for the price...? Who can beat it.