Good points that I missed in the article
While Calibre is a great tool for the user experienced with eDocument formats - it does require some basic familiarity with the various formats and where and when they are appropriate depending on your e-reader platform of choice. It assumes you understand the difference between ePub, Mobi and other digital document formats. My gut feeling is that it might be a little overwhelming if you're just starting to expose yourself to the world of eReading - it is a pretty powerful tool.
On the other hand, if you're involved in a technical industry like I.T. and you understand the basic concepts of file formats and compatibility - it shouldn't take you a lot of effort to get up to speed, and Calibre does offer all of the basics that will allow you to download, organize, convert and read a variety of inexpensive e-format documents for a variety of digital devices - plus it is a full fledged eReader platform for your desktop PC. You could inexpensively get your feet wet, copy documents to your Android or iPhone handset and save some money while deciding if your usage justified buying a Kindle, Nook or tablet.
Provided that you're technically adept - it isn't the most complex application platform to jump into.
I'd suggest you give it a try, and if you have any questions, go ahead and post here and I'll do what I can to help you out.
Contributr 
