Charles proxy was easy to install, and easy to use once I got the hang of it. I always used web based proxies, so this was a little different but once I got the settings right, all was smooth sailing.

Able to easily see what network calls are made

This is one of those tools where you ask yourself how you could ever do your job before you had it. It makes debugging network communication so much easier, and it also helps in inspecting what communication takes place to begin with.