Nope. Just know what kind of footage you're dealing with and choose a quicktime codec to match. I.E. if it's DVX footage then render to a Quicktime in Premiere with a DV25 codec.
It will be wrapped in Avid's OMF or MXF wrapper (depending on your settings in Xpress pro). It will still be DV25 encoded material, but if you wanted to go back from Avid to Premiere you'd have to export it again from Avid and re-import it into Premiere.