I like that we can see what our visitors are doing at all times, even when they're not logged in! It's very helpful for getting an idea of how many people visit certain pages as well if someone is looking up information about their product or service/somewhere else online (website).
Nothing really - it works perfectly fine but some options could be made more intuitive so less clicking would have been needed from time-totime with using this software; however once used i've never had any issues again since then!!