The good: Not gonna get a better deal on uptime monitoring with controls like this anywhere. Even given "the bad"... it's a keeper! Just be aware...
The bad: adding sites in bulk could be easier. Some of the settings from the general settings applied, but not the more cumbersome to set like international monitoring. Plus, getting a lot of time-out errors.
The ugly: adding sites in bulk that mostly live on the same server had about half of them initially report as down, using almost a quarter of my SMS credits to let me know.