I've tried both, in 30 day trial mode, over the past couple of months of :43: use. I liked Aperture for it's price and general ease of use. Lightroom was more difficult to use initially, but lately I've come to really enjoy it. Both are licensed for a desktop and laptop, which is great. I'm mostly shooting in RAW and using the software to generate color profiles that I like more than the native GF2 output and to apply different color filters to B&W photos. I haven't done a lot of experimenting with brushes and retouching, but the two seem to have similar capabilities in that regard. The one big functional difference that I have noticed is the noise reduction and sharpening algorithms seem to be better in Lightroom. I've gotten some very nice improvements to 1600 and 800 iso shots with a combination of NR and sharpening. I'd like to appeal to the collective wisdom. Assuming you are a apple user, why did you choose one over the other? Are there major points that I have missed? How is each in terms of plug-ins and expandability?