NZBGet is intended for grabbing NZB files from Usenet. In this regard, it helps you avoid the difficulties normally associated with downloading this type of content. Although the application can be launched from the command line, most users would prefer to use its web interface instead. Accessing the tool from the web interface has the advantage that you can manage your download tasks from other computers, even if they use different operating systems.
The user interface is characterized by organizing features into tabs. In this respect, the Downloads tab allows such operations as adding and deleting tasks as well as pausing and resuming existing processes. There is also the History tab, which, as you may have guessed, keeps a list of recently download contents. The Messages tab, in turn, works as a sort of a log, showing relevant info as to problems and errors. Finally, there is the Settings tab to configure other aspects. For instance, you can establish limits to bandwidth use to avoid affecting your Internet browsing speed.
Compared with other NZB downloaders, this tool has some limitations. For instance, it does not have a built-in search function to find Usenet files. Likewise, it does not support automating actions by setting rules.
All in all, NZBGet is a reliable NZB downloader, which does not require many system resources. I am glad that it is open source and can be used for free without any limitations. However, you may still want to try a few similar applications before making a decision.