I was thrilled to find a hardback copy. I'm taking a Greek class at my church, and I had borrowed my sister's small leatherbound copy from college. This one is sturdier than the leather one and has plenty of margin on the sides and bottom for notes.
I bought the NA27 wide margin as I wanted to go deeper into the text, and at the time this was the cheapest copy of the NA27 available. I have not regretted my decision at all. The critical work is in depth and it has added much to my study. With that said if you wish to use this copy in order to write notes in the margins, be careful on the pen you use, as the pages are so thin that most pens will write through them.