The fact we can track our servers at all times from anywhere in the world! Also being able to create custom reports for each server/service which makes things so much easier when looking after them remotely.
There are some minor bugs here & there but nothing major enough to dislike as such. We would highly recommend this product especially if you're running multiple websites off one hosting account (as most people who use webgazer do). Being able to get an overview over what's going wrong easily via email notifications has been incredibly useful.