The demo was amazing.
I only have 2K7 now because I didn't like 2K8 for some reason from the demo. I was actually impressed by the NBA Live 09 demo and thought it was almost on par with 2K8. Now however, NBA 2K9 will clearly be the best basketball game this year.
Plus it has the whole 5 vs. 5 online thing and that was the only redeeming feature of past NBA Live games.