Wow! I spent 20 min or so going through the website and it's a great resource, especially for anyone in the application phase. Check out some of the School A vs. School B articles. Very detailed with some great material for essays. I can attest that the stuff on Tuck is very accurate.
The fact that the guy was able to go to some of the schools and interview faculty and students then post it on his website attests to his connection to the MBA community.
GMAT Club Premium Membership - big benefits and savings