It was implied, if not stated, earlier in the thread that using the plugin was too great a risk to one's Aperture library and to one's RAW files which is simply incorrect. That's what I was addressing. Don't worry about may feathers; I have thick skin underneath them 😉
There's actually a third way to get your edits over to LR5: Choose the option to import full-size previews. (Of course, you have to have generated full-size previews in Aperture.)

I don't choose this option because I don't want the bloat, but it would have been interesting to see A3 edits next to LR5 edits. I think it's better to export selected versions- if one is going to do it at all- rather than have an extra jpeg of every image that's been adjusted in Aperture. However, in most cases, if I have to use more than one or two brushes the image is going to Photoshop where I can reuse masks. If I'm color correcting for print, the image is going to Photoshop too, so most of my most important images already have PSD or Tiff versions.
Yes it's a huge pain to redo adjustments on images that you've already worked on in another application. (I try to think of it as taking a negative back into the darkroom to print again after some time has passed. That's basically the same thing as staring over with a RAW file.) Yes it's a huge pain to migrate from one DAM application to another. However, the plugin saves hundreds of hours of tedious metadata work that I don't care to repeat, and that beats a poke in the eye with a sharp stick.
I have eight years- and a few certification exams- invested in Aperture, and I didn't ask the company to kill it. However, I saw the writing on the wall, and I've been trying to make the move for a couple of years now. The plugin is making that a little less painful.
DLS