I have an 18 incher and I love it dearly. It has cut a many logs and still goes on. It does not vibrate much at all, it has large gas and oil tanks.
Now, John Deere used to make Homelite, but I have heard that they have divested them selves of this line completely.
So, I would have to say that my Homelite is made by JD and therefore running fine. But, the new ones are NOT and I am not sure of the manufacturer. So, if this is the case, do not take my recomendations on the new ones.
Other wise, if you have the budget go Husquavarna or Stilh.