They do one thing instead of many, and they do it well, but the pricing model didn't work all that well for us. Besides, it's still one step behind Amplitude and the likes in terms of seeing the customer journey. I would still recommend them for the search function.
The best way to watch how your users use your app or website. Great UI and immediate value.
Cons:Not enough ways to frame data beyond searching "Who did what". Do I need this AND Mixpanel?