Questions about Extending AD Schema – Server 2008 R2 and a complicated environment

Our University is looking at extending our AD Schema so that we can manage our Macs on campus. I've read the white paper and watched the video, but I just had a few questions for people who currently have their AD Schema Extended: 1. Has anyone done this with Server 2008 R2 yet? Any issues? 2. What is your opinion of this setup? Does it work well? Is it equal to the magic triangle-style setup? 3. What happens when OS X Server gets updated (going from 10.5 to 10.6 for instance), do you need to update the AD Schema and how does this work? 4. Does Apple support this? Can long term support for this type of setup be counted on? 5. Are there any regrets setting it up this way? What hard lessons have been learned by doing it this way vs a Seperate OD server? Thanks in advance, Nate