What are the key strengths and weaknesses of Zyngas strategic positioning?

What would be the impact to Zyngas net income for 2010 if they had used Bookings as the revenue for that year?

How would Zyngas revenues from durable virtual goods for the first three quarters of 2011 change if their assumption for average playing period changed from 18 months to 15 months? (Hint: Think in terms of the algebra and not the actual revenue numbers.)

Comment on Zyngas revenue recognition policy. What are some of the advantages and disadvantages of this policy from Zyngas perspective? The numerical calculations do not have to be exact as long as they are logical. Clearly state the assumptions you make.