Still slow
I've used MM for maybe 6 years. The web client has always been slow, but lately it stalls so frequently I cannot use it. I have 2800 emails in the inbox, but if Apple cannot figure out how to code "sync only some" then they're in trouble. I have no folders being synced.
The whole mobileme suite is problematic. I am briefly entertain when there's a contacts sync war between my macs (they just butt heads for hours), but it gets old and I end up deactivating contacts sync. I deactivate calendar sync. I brought down one of my macs foolishly trying keychain sync.
Short is, none of it works well. It's all sub-AAPL, and I don't know why they don't kill it or fix it (obviously, it's essentially free money, but that's not something wisely abused).
I hope the data center that's coming online soon fixes this. Otherwise I will think hard about renewing MobileMe next time the schedule comes up. It's just not as good as Google.