Pros
It has a great culture and environment. The office (in Denver) is very laid back. Micromedex is a tech company at heart so much of the traditional positive traditional tech attributes exist here - casual dress, low stress, employee perks. I worked in the finance group and came from a financial services background. This was almost culture shock for me.
Cons
As part of a large corporation (its even larger know with the merger of Thomson and Reuters), there are the typical beuracracies and negatives that come with a company of this size. One of the good things though is that Micromedex is a smaller, almost stand alone, part of the parent. So this is less of a negative. The finance group was small, so was little opportunity to advance your career.