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The P.S. does a lot here: 1. Teases about more information & says you must read the letter to find out. 2. Goes into more detail about the value & emphasizes that it's brand new & proven. 3. Reiterates the offer at the end with a final CTA link.
"Present" is great wording for a free + shipping item as it would normally be rude to reject someone's present or gift to you. Instead, you'd accept it & do what you want with it after.
Frank is known for short subject lines that sound like they're coming from a friend & not a marketer.
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