I made Missing's oaked blueberry mead from
this post, using 1 oz each of medium toast Hungarian and American oak cubes. I'm maturing it until about March, but remind me and I'll let you know. It tasted really good before the oak, a little dry with some higher alcohols, but still pretty drinkable. I'm hoping the oak will give a little more (perceived) body and sweetness, but I may back-sweeten.
I did the mixed oaks because I wanted a mix of the characteristics per Northern Brewer:
American: aromatic sweetness and a campfire/roasted coffee attribute, light fruit and a nice mouthfeel;
Hungarian: pronounced vanilla with background notes of bittersweet chocolate, roast coffee, leather, and black pepper.