I reached platinum tier this weekend in LV. I'm on the fence about renewing diamond for another year.

The two biggest benefits from my perspective were free food and parking in AC. The only diamond benefit I have used in LV that is not afforded to platinums is the diamond taxi line. The separate hotel check-in and buffet entrances are also available to platinums.

Now that I am hitting LV more often than AC, I'm not sure making the effort to renew diamond is worth it.