When I started out years ago in the east, dead elms were everywhere on account of dutch elm blight. As a poor boy, I burned more than I wanted to. And once I had other wood available--burned almost entirely oak for many years--I figured I'd never again burn elm.
Now I live in a pine forest--Ponderosa pine, which is quite a step up from white pine, but it's still pine (also some Doug Fir and lodgepole). So I scrounge all I can of hardwoods that grow in the towns downhill from here.
Siberian elm grows like a weed down on the plains. I just brought home several loads yesterday and today. It burns pretty decent. It's still elm, so I'm not thrilled with the smoke aroma when I step outside. But it's not bad firewood. And maybe it's our dry climate, but the stuff dries well in a few months.
Another reason I used to hate elm, was its un-split-able nature. (Until a few years ago I hand-split everything.) But I learned a trick with elm. Where you'd normally sink your splitting maul or wedge in a line thru the center of a round, with elm you'd split pieces off the outside, by striking the sharp edge parallel to the bark and just a little ways into the round. (My hydraulic splitter goes thru whatever I feed it.)