There appears to be two listings. The cheaper one uses the old photos, thusly we can assume they are the older Vibes. The more expensive ones use the newer photos, so we can assume they the new ones.
You have to remember though, there were multiple versions of the "first gen". The pre-production were apparently not at all like the production, very light on the bass in comparison, not much known about these since they are very rare. The first production model was good too, copious bass, but it was tight and controlled, or somewhat controlled. The second production is apparently where all the bad reviews came from, it isn't clear what happened here, but the bass was less controlled. I believe the third change came when they added another port that you can't see in the back, the pre-production had this, so they figured this would help bring the sound back. Then the fourth change came with the strain relief and the black pouch for the first time. Finally we come to the current one, the first major visible change, with the new Duo style plug. The positive comments makes it look like these are another good one.
So that is the summary of real generation and changes as I remember it, you can find out more by reading basically every page of the thread, but it is a lot less simple than first and second gen. I would go with the current one. The consensus on it is that it is pretty good again, whereas with the older one you'll probably get the most recent of the "first" gen, which is better than the second iteration, but not as good as the first and possibly not even as good as the current one.