My answer: genius. If you do it right. My advice (from experience) is to use less cedar for longer time. If you use more, you pick up more of the sweetness than the cedar-taste. Use a little and let it sit for a while, an ounce or two for a month or so. As most will suggest, sample the beer every few days to see how it is progressing.
Here's a post I posted yesterday about a cedar-aged smoked munich dunkel:
https://www.homebrewtalk.com/f36/first-wood-aged-beer-gets-second-place-friendly-contest-251015/
I used about 2 ounces for 2 weeks, not enough. Next time I do this beer, I'm going to do 1-2 ounces for at least a month. This came out a little sweeter than i wood have liked and not as smokey. My suggestion is to complement the cedar with smoked malt. I used .25 ounces of smoked malt (mine was an extract brew with a few pounds of grain for steeping.) Not sure the exact amount, but the recipe called for somewhere around 2 pounds of crystal malt, so I did like 1.75 lb crystal malt and subbed the other .25 lb with smoked malt, which is nowhere near enough. Didn't get the smokey flavor and only got the sweet cedar off the wood.
So to recap, I'd use more smoked malt (don't be scared, some beers use mostly, if not all, smoked malt as in the grain bill) and use less cedar but for longer times, as the first tannins to get taken from the wood will be the sweet ones, and the good, deep, cedar ones take a little longer.
Sorry I ramble. Good luck, keep us updated. Cheers.