Hi.
I just ran this update on my Moto Q through the Alltel provided software. It did ask to backup my personal data, and though the update failed twice, probably due to restarting, it finally did finish.
Upon restart all my contacts and photos are still there, but it didn't backup my email settings or sent/received text messages. Also as expected it didn't backup any third party apps, which wasn't a big deal -- I only had Google Maps installed.
Was this a bug fix? I hoped it would be upgrading to WM6, but everything looks just as it did before, plus I see no added features or changes. If it fixes the random reboots, that alone is worth it.
Oh, and "Get Office Sync" is still there and still won't let me delete it

I noticed someone mentioning this in an earlier thread.
Take care --
Sam Alex
samalex@gmail.com