Yes, it is up there on the BTU chart. And although its been said before I'll say it again, its good in the smoker too.
It's heavy when green (high natural moisture content) and takes a good while to dry, but it's very rot-resistant and makes excellent firewood.
Its good wood but I question the BTU rating, burn some every year and dont think it deserves the high rating, for some reason it gets really lite when dry, White Ash and Oak are much heavier when dry.