Like many others, I wore the style 600 for a few years.  Not being able to find that number again, I called New Balance and they said the 608 is the replacement for the 600 they no longer manufacture.  I asked why is it called V3 and I was told this is the 3rd version they have made.  So I ordered these from amazon and am very pleased with this style.  It's really quite comfortable; sturdy and supportive for walking shoes (actually they are cross trainers).  I would not wait too long to order them again, before they discontinue this style number and then I would have to search and search for something comparable.  I get seriously annoyed when manufacturers change styles just because they can, even when there isn't anything wrong in the first place.