Been vaping the 510 for a while now.  It was pretty good.  Definately, helped me quit.  I was a half pack type of person a day.  I personally like the Manual version better than the automatic.  I had a lot of battery problems with the automatic version, the juice would get in it and kill the battery.  I saw some posts about Sovereign and Volcano 510 models.  A friend of mine used a Volcano Magma (510), I compared the parts to my 510 and the atomizer looked different.  Mine seemed to generate a little more vapor, I think the ring in the Magma or Sovereign atomizer is the problem, but what do I know.  That seemed to be the major difference.  But now I’m actually over the 510 because the battery life is just crap.  It was good while it lasted.  Sorry 510, time for your retirement. lol  Now there are better ecigs out there with longer lasting batteries.  I’m here in Hawaii for the summer and just ordered a Fatty.  Can’t wait, the Fatty reviews are great…I’ve been waiting for an ecig like this.  Long lasting battery, and still a mini!  I’ll updat you when I get it!