Just for the record: its 1 inch longer than the map in the original (3.5) campaign guide, but otherwise similar in size. (Got my new campaign guide today)
The colour contrast has been improved, and the wording is a lot bigger and clearer. The borders are also clearer. (One early PC was from Ostenso, in Andoran... in the campaign I was playing in)
It's certainly a better map, but if you have the original map, I am not convinced its worth the extra money to buy it seperatly.
If you want a nice big map, and don't want the campaign guide, or the even bigger map, its a good product.