For me, I would wait for October to come. There would have many topics and testing about if the GMA950 can run all of the powerful 3D graphic layout in Leopard.
If people find out that GMA950 cannot run smoothly in the advance 3D graphic layout in Leopard, apple should do something to response and that is to update its macbook with better built-in graphic card.
I want to buy a macbook, but i would wait for Leopard come out and read the review and topics then.