I have been using PFE for quite some time in all of the various fltsims. Do you in the near future plan on updating the PFE to Xplane plugin? I just purchased it a week or so ago and today I bought PF3. I hope the PF3 to Xplane plugin is on your calendar. Do to the large size of PFE, I removed it and now using PF3.
You can update the PFEtoXPlane as follows...
Download this patch, unzip and replace both "64" and "32" folders inside \XPlane 10\Resources\Plugins\PFEtoXPlane\ folder
http://www.multicrewxp.com/PFEtoXPlane-Patch.zip
By default plugin will look for Pro Flight installation in the following order
PF3 registered version
PF3 Demo version
PFE older version (V2.15)
It sets itself up to the first one it finds.