Live traffic view that show the IP and Hostname, see who logs in, see what pages are not found along with who was trying to access that page (great for bots or hack attempts), country blocking (although you have to pay for it but it does keep the majority of countries out.)
I love that there is now an option to block IP's that try to login with certain usernames. With that option it has stopped nearly 20,000 admin login attempts.
I've noticed lately that when I click on an IP to see what pages they've visited sometimes comes up blank. And I've not been able to get the Falcon Engine to work, my site comes up as blank but that's not a big deal to me to use. I also no longer use the scans, maybe my site is too big but it hangs and never finishes scanning.
I stopped using the feature that blocks fake Google bots, it started blocking the real Google bot.
Overall, great plugin, has prevented hacks and gotten rid of annoying bot scans by blocking those IPs. You have to use it a while to see what features to not use, but it's the best one for monitoring live traffic.