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Pros
Pro Automatically captures JavaScript errors
Unlike Airbrake, you don't have to add try/catch blocks to automatically capture JavaScript errors.
Pro Hosted on a CDN already
Unlike Airbrake or LogEntries, you can download the library from GitHub and concatenate/minify it along with your other JS, or you can use it directly from Loggly's CDN.
Pro Supports raw text, syslogs, and JSON
Raw text, syslogs, and JSON can be fed to Loggly.
Pro Easy to set up
You only have to set up a HTTP JSON input and there are community examples to guide you.
Cons
Con Expensive
Loggly QUICKLY overflows the 200mb daily free allowance.
Con Difficult to setup
Setup is not easy, the whole process is disjointed, with open source libraries that regularly change and out of date installation instructions.
Con The UI is confusing
The UI is very difficult to use, but it does offer a lot of features.
Con Timestamps are in UTC in the UI, and can't be converted
Loggly shows all timestamps in UTC, and the bookmarklet that's supposed to convert them to local time doesn't work.