I would pay off my 15 year mortgage within two years instead of 9 years! No other debt and no huge wants or needs other than my daughters wedding next year so I suppose I would save and invest more.
As of now, I'm the only 50/50. That's just a guess anyway, I have never had a windfall so I don't know how I would actually react to one if it happens. Also, I was going with the realist answer of 50/25/25 = 50% goes towards paying the income taxes, 25% goes toward spending and 25% goes to savings.
Unless of course I found a dufflebag full of cash and then it will probably all go into gold, guns, and ammo. I been eyeballin' a Benelli M4 pretty hard for a while now (since it's like the only thing you can own in this bullshit state).
It wasn't an option, but I'd spend 10-15%, put 20% to the side for emergencies (if you have a house, then you have emergencies all the time), and save the rest.