When comparing Leech vs Folx, the Slant community recommends Folx for most people. In the question“What is the best download manager for Mac OSX?” Folx is ranked 4th while Leech is ranked 9th.
Specs
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Pros
Pro Can download from a Plain Text file
Must be in *.txt format/extension.
Pro Unobtrusive
Option to download in the Leech download client in the background without losing focus on your browser and to automatically quit Leech when all downloads complete.
Pro Remember login and password for websites
Pro Speed control
You can set up speed control in different ways.
Pro Allows torrent search
PRO version of Folx enables torrent search directly from the application.
Pro Splitting of downloads in up to 20 threads
Download can be split into up to 20 separate simultaneous downloads - threads. When the server supports multiple connections this can greatly improve download speed.
Pro Scheduling of downloads
You can choose the time for starting the download.
Cons
Con Not free
Con Doesn't work with Google Chrome
Leech only works with Safari and Firefox (possibly similar browsers) with the FlashGot addon properly configured. Some other download managers have extensions that work with all the popular web browsers. Leech only has one extension for Safari.
Con Customer support is terrible, do not send them money
Customer support refuses to be helpful. DRM must phone home and support blames you when their website goes down.
Con Does not quickly close after download completes
It takes 24 seconds before folx will close when a download has completed, and this window pops up and grabs focus interupting whatever it is you're doing. Very intrusive.
Con Sometimes it doesn't complete the schedule
Con Sometimes downloads start automatically
Con Difficult to uninstall browser addons
You will need to uninstall the addon and then clear the browser's cache. With Safari you will need to enable the developer menu before you can do this.
Con Useless
Can't download anything without upgrading to Pro paid version.