Half a year ago, I would've pumped my fist and screamed "Hell yes". That was the biggest feature I've missed in Outlook.
However, Gmail has been so excruciatingly slow that a month ago, I've switched back to Outlook (Outlook for Mac 2011), and haven't looked back since. It feels really good to use an email client again that responds to what I do instantenously. Web email clients still have a way to go.