Writing copy for a physical product rather than an info product

It's the same stuff amigo.

Get thee to some Joe Sugarman ads...

In my experience tangible stuff is an easier sale because people most often know what it is and what it does. If they aren't schooled in the workings of a physical product because it's new then it becomes the job of the writer to explain it and make it appealing during that part of the pitch. And unlike images of a digital book, pictures of physical products actually mean something.

I'd suggest you and any other aspiring copywriter forget about long versus short copy. Write to sell. Period. However it comes out is how it comes. As I've written before, you need to write for people who want it short and for those who want lots of details. You accomplish that through proper formatting.

That's the use of bullets, highlighting, boxes with important benefits and features, compelling paragraph headers and more. People who like short pitches are able to skim through your high points while those who want every detail can get it by reading further into the text.