My DH and I just use a joint bank account, so my experience is probably very different from yours. For us it works to treat all money as "ours," and we do this even with money that legally isn't both of ours, like our premarital assets, since we're in an equitable division state. We also share passwords to accounts that are in one name or the other. I think this works easier for us, especially since I've given up working more to do more of the childcare (our daughter didn't go to daycare), and he's done more of the money earning. I don't know how we'd manage split accounts, though I'm sure some couples in our situation have done that.
We don't have regular money meetings, but we do consult each other if we're going to spend on something out of the ordinary. And we do have occasional discussions about plans for money and retirement, mostly inspired by this site/forum, because I like talking about money.
I'm not a lawyer, but I'd definitely take a look to see what the laws are in your state. If something goes wrong, you don't want to be surprised that the way you've divided your assets isn't how the law will divide them.
Also, consider the source of the windfall. If you're in an equitable division state, if the windfall is an inheritance or gift just to your husband, then I don't think it would be split in case of divorce, I think it'd just be his. Again, not a lawyer, so not legal advice, but something to think about.