OK. I performed the update on my WPDN last night.
First, it does reset all user information, settings and apps. You will have to set back up your date/time, wireless access, and re-install all apps.
It does run faster than the 1/14 firmware. I had applied a graphics hack and an update to the JIT on the 1/14 and, to me at least, the 1/27 seems to run at about the same speed without any hacks applied. This is based off of the responsiveness of a couple of ereader apps and, of course, Angry Birds.
I will probably run a clean flash with no hacks for the weekend at least before I start looking into any "tweaks".
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