Yes, same as bois d-arc. You are correct, it is highest BTU. We used to burn it for heat in winter, and it will warp a stove if it is not made of good thick metal. It'll crack cast!
It likes to throw off sparks when it has been denied full oxygen and then is exposed to air again. Will be hot as Hades even if choked down to mere embers in a wood stove for heat.
Cutting it will dull a chainsaw quickly. I used to have to bring along 2-3 extra chains to get a trailerload of it. Never considered it to smoke with, probably because hickory, maple and cherry are plentiful here.
Double-Barrel Smoker (DBS); Ugly Drum Smoker (UDS)