When comparing iGetter vs DownThemAll!, the Slant community recommends DownThemAll! for most people. In the question“What is the best download manager for Mac OSX?” DownThemAll! is ranked 1st while iGetter is ranked 7th.
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Pros
Pro Free version is fully featured
You can pay $20 for an iGetter license to help the developers, but it won't unlock any additional features - all of the pro features are available in the free version.
Pro Resumable downloads
iGetter will automatically resume downloads when possible (some sites prevent this). This means that you can put your Mac to sleep half way through a download, and when you turn your Mac back on it will resume where it left off instead of going back to the start.
Pro Schedule downloads for off-peak hours
Downloading stuff while you are on your computer can tax the internet connection. With iGetter, you can schedule downloads for the wee hours of the morning when you (probably) aren't using your Mac.
This can also help with data-caps, as some providers have unlimited times early in the morning during off-peak times.
Pro Allows multiple connections to a server, speeding up downloads when supported
Cons
Con Not very intuitive
Everything is a bit more confusing and takes a bit longer to do than with other download managers.
Con Free version has a dialogue box
Unless you pay $20 for the license, every day you will have a dialogue box pop up for 15 seconds.