The instrument costs $495 for individuals, it asks 298 online questions, and it takes about a half hour to complete. Your results come with a one-hour feedback session with a Birkman-trained consultant. This summary comes from Fortune, March 22, 2010 at 48.
The management team of a legal department might take the assessment and thereby learn more about themselves individually and as a team (See my post of Sept. 22, 2006 #3: Birkman Method.). It would be a good exercise for an offsite meeting. Everyone learns from their own confidential, 50-odd page personalized analysis and the four-color grid it places you on. The report delves into your work styles and your career interests.