I tried this out, and got the continuously running Activesync. Seemed almost to be fretting about 0/1 Calendar and 0/1 Contacts constantly even when no changes made.
Also noticed the sync was *slower* than my Exchange running off my home server, but I assume that's due to the massive rush to try the service.
For contacts, it sucks because the only way to get your contacts to the phone from Outlook is to export to CVS, and import that file to Gmail. As in goodbye Outlook categories and your contact photos disappear.
Be warned about the limitations of Google Sync too -- things like recurring appointments have a LOT of bugs on the Google Side of things. I ended up with 3 copies of all my recurring appointments, but the other potential side effect includes the mobile device dropping it altogether:
http://google.com/support/mobile/bin...&answer=139655