They enabled ActiveSync/Exchange support for Gmail finally. I was already using it for Google Calendar on the iPhone. It's nice that it's one account, but honestly, it doesn't matter that much since I have no desire to enable push support. If you do nothing at all with your phone the entire day, push will zap the battery 30%, morning to night. I don't even have my phone polling for mail on intervals. First, I'm generally near a computer all day anyway, and second, I just don't need to be that connected.
One negative about using sync is that it doesn't expose the real trash. Pushing the trash button correctly archives the e-mail (into "all mail"), but you can't transfer a message to the real trash. I have no use for marketing mail or miscellaneous notifications, and as such I trash those so as not to create noise in the archive when I'm searching for something. Yes, I have nearly 30,000 e-mail messages dating back to 1996. (IMAP got old mail into Gmail.) I was such fuckwit in 1996. :)