I've heard BL posts last even longer than the poison infused stuff (pressure treated). I've heard it can be used in timber and framing and other wood working, but you have to get it when its half dry. Once it fully dries you can't drive a nail in and it eats drill bits and saw blades.
I have some dried in my woodpile, I save it for cold night burns. It is my current favorite, I'll see how it stacks up against oak next winter. I planted a dozen saplings for my retirement firewood supply. I figure that the way it spreads like a weed I'll have a whole grove in a few years and I'll never have to go off my 2 acres for firewood.
Some folks say its garbage cuz it grows so fast, not way it can be worth burning with growth rings that far apart - but on the chart (BTU/cord or BTU/ton, I don;t remember) its right up there with oak. And on that note Osage Orange is the top of the list, and it grows fast like Locust.
I used to scavenge for firewood, now I get to pick and choose what I keep and what I trade for having a splitter and help show up to split it.
This year I brought home a lot of oak, which is the only wood I kept (almost 3 cords), and gave away some oak and all the "not as good" stuff.