Sorry for the late reply, just saw this post. I use Aperture for Raw import and managing files, but tend to use PS for anything beyond crop/straighten, WB and exposure adjustment.
I tried both the dxo filmpack and alien skin exposure in both Aperture and CS6, and came to the conclusion that having the plugins working on layers in PS was better in my workflow.
You can see a few examples of the types of output I got during testing a few of the various film simulation packages including dxo in this series of posts on my blog
I didn't really see any noticeable difference between the few images I processed in the Aperture versions (for the ones that work with Aperture) and the PS plugin versions, but that wasn't my focus. So, I continue to mostly open the partial edited images in PS after importing in Aperture.
Btw, I decided not to get dxo after the trial period expired. I really like the way you can use the tools in Exposure better than dxo. Plus some of the default film simulations look better to my eyes.
I'm curious how you're using dxo these days? Are you working only in Aperture?