Wrong..it is in the family Acer and is therefore by definition a maple tree.That is exactly the kind of misinformation that a little reading on your part could fix..hell,your own link tells you it is and it is on scale with other softer varieties..as well as every other professional wood description site.Don't be a maple snob
http://en.wikipedia....ki/Acer_negundo
However,it is softer by far than "soft" (bigleaf)maple...just being in the maple family doesn't mean it is suitable for necks.
The Box Elder is, for some, an odd variety of Acer, still, not a real Maple tree if you ask some experts ... hehehe. Yes, I do know my Maple trees. We have tons of them around here. I even have one of these "Box Elders" in my backyard. These trees are a pest as they grow fast, anywhere and everywhere, causing problems most of the time, so much so that some cities have banned them and destroy them in certain areas. The branches break easily and when you look at the wood, its very white, often with red streaks. It is mentioned in my own link, yes, but not everything you read on the 'net is 100% true. If a lumber store sold you this wood as maple, they would be screwing you, period.
In my experience, it is softer than "soft" maple; is some cases, closer to poplar IMO but it also depends on where the piece of wood comes from in the tree and where / how the tree has grown (kinda like Ash/Swamp Ash). The Janka rating for poplar is approx 500. That link I provided has some errors in it for sure.
If you would care to do some research, Wes, you'd find that it is in fact not a proper acer but most of the internet data for it is in french, not english. Some botanists call it Negundo aceroides
http://en.wikipedia....ki/Acer_negundo
Some people also refer to it as "Ash Maple", but again, it is not Maple, nor Ash. Do you know what makes a tree part of the Acer family or not? Many botanists do not consider this tree to be an Acer family tree.
It was mistakenly put into the "acer" family by french immigrants to the USA/Canada (more specifically, Illinois) in the XIX'th century because the seeds looked like maple seeds. You can also look for "Erable à Giguère" and "Manitoba Maple" if you're interested in learning more about these trees. If the internet is your primary source of information, you might be dissapointed as there isn't much info on this tree.
I hope this helps and that it didn't take this thread too far off course.