but it is still amusing to note that the first part of Brand New Day did, in fact, sell out and go to a second print.

Of course, if you note that, you must also note that selling out and going to a second print means little to nothing in terms of how popular a book is. I mean, it is better to sell out than to NOT sell out, of course, but unless Marvel did a tremendous overprinting of Amazing Spider-Man #546, they WERE going to sell out of the book, make no mistake.

The real test will be how much Amazing Spider-Man #549 sells, as I believe that's the first issue that retailers can adjust their orders on, based on how many copies of #546 they sold.

If that issue remains a good seller, then yes, Brand New Day is most likely a popular book (and do note that, of course, it is always important to check back in a few months, too, to see if the book sells once the media spotlight is off of it).