There are some issues...that's good to know, looks like most people with personal experience who have commented on win8 & MP have had little/no problems, This goes against what I've read previously
Unless you change the whole shell you get the metro interface and the auto start / green button does not quite so the job.
I believe there are issues mounting images and possibly creating thumbnails (running exes from inside MP).
MP will not quite install properly (kind of works in compatibility mode but is not working all the time)
Not come across anything that is causing me a problem yet though.