From bible.org's Facebook page a user asked the question:
How do I decide which version of the NET bible to buy?
There are four printed versions of the NET Bible:

• First Edition (with all the notes - over 60,000)
• Reader's Edition (large print, with limited footnotes, 7,720)
• Compact Edition (pocket size, same number of footnotes as Reader's Edition)
• Diglot (Greek English with facing pages of Greek and English. Contains the Nestle Aland 27th Edition Greek text)

Here are a couple of comparisons of the printed NET Bibles:

• http://bible.org/article/net-bible-print-comparison
• http://bible.org/article/net-bible-print-samples