Hey there!
Yes, familiar with Mikkeller. I have been living in CPH for 1.5 years now as I am doing my master degree here, on food tech / brewing actually. As brewfun said, and I think it holds true; he is sometimes regarded as the Lady Gaga of brewing. I've heard some people joking about him saying that whenever one of his brews goes bad, he just adds a lot of hops, barrel ages it, puts on a fancy label and then sells it as pure gold.
Although not true, he is quite a personality. Most of his brews are extreme as that is one of the thinks that characterizes him the most... trying new ideas / ingredients and flavors. All of the brews I've tried made by him lie in the : this is "ok" to this is actually really good range. What I think is most interesting is his approach to collaborations as that opens the door for creation of things with interesting spins and going in all possible directions.
Cheers!