Seems native Americans spread the tree beyond its natural range due to properties for bow making. Largest one in the US is not in the native range, but in Virginia according to this
http://www.redhill.org/tree.htm
Some people call it "bodark", a corruption of French
bois d'arc, meaning "wood for making bows". I find it pretty similar to black locust, in appearance, density and of course, thorns. I have heard stories of osage orange fence posts that were set in the ground in the 1700s still in use.
The highway department cut a large osage orange tree at the edge of our property next to the right-of-way a few years ago, just before I started heating with wood, and I got enough from it to last several winters, although I always mixed it in with other wood to make it last, since when that supply is gone I don't think there is any more on my property.
This summer I decided to order a new grate for my Harman Oakwood. I told the guy at the store that my old one warped the second season I used the stove, and has been getting worse every winter since, so I thought it was about time to replace it. The first thing he asked me was if I had burnt any hedge. He said it has loads of BTUs, but burns too hot for modern-day EPA stoves, and sometimes even causes parts in the stove to melt. He says the best way to burn hedge is to "stack it in a pile out in the middle of the field".
I'm not sure it's as bad as he says, but maybe the safest way to burn it would be to mix it with other wood, which is what I have always done, and not load the stove up with nothing but hedge, unless that is the only wood you have available.
I never had any problem with it ruining or wearing out my saw chains, any more than cutting red oak and black locust, although the tree I cut up had been down only a couple of years and probably was not fully dry.
I never would burn it in a fireplace, because of the sparks it spits out. My stove has a viewing window on the door, and osage orange really puts on a light show.