I don't agree... As I feel there are only a handful of trustworthy companies and quality products.
I run a 5000e heatmaster, another member yoderheating has ran a EPA phase 2 gasser and he'll tell you the same thing I will. The e series were using is probably not over 10% less efficient and none of the hassle. The gassers have much much much more maintenance and your wood has to be cut smaller, split smaller, perfectly dried for these things to perform correctly. If you'd run out of seasoned wood and had to burn green at some point, forget it, won't happen in most of them! Not at all.
With the stove I'm using it has a double passs and keeps exhaust gases in the water tank much longer and provides greater efficiency. It will also burn anything you put in it, green wood, dry wood, coal you name it. Try that with a gasser, they are finicky!