Shot a wedding Saturday and dumped the photos into A3. Everything is ok. Started processing and all of a sudden the computer locks up. Totally freezes. Beach-balling mouse can move around, but that is it. Had to force restart my computer. All of the thumbnail previews are gone! Computer starts "processing" in the background and slowly rebuilding thumbnails at the rate of about 1 every 2 minutes. This is unacceptable for culling, as it would take me over 2000 minutes at that rate! I started randomly clicking photos without the thumbnails and doing some editing once the preview generated. I do this for about 2 hours, planning on letting the computer think throughout the night. A3 crashes my computer AGAIN! Restart, all the thumbnails and previews are GONE, AGAIN! Enough is enough I figure, and I download the Lightroom 3 trial. Sure, it is super-wacky looking and confusing to use compared to A3, but it has not crashed or even beachballed ONCE after working on it all day. A3 normally needs restarted a few times a session. Initial things I have noticed where L3 has the edge over A3: Lens correction. I am an UWA junky, especially during the reception on the dancefloor. Being able to apply a preset correction to all my UWA shots is a godsend. NOISE! I did some side by side comparisons of the noise removal tools, and L3 blows it out of the water. ESPECIALLY in darker OOF areas. Consistency. L3 "just works" as far as I can tell. I hate having my raw files constrained in a "Library" file in A3. Love the desktop hierarchy system in L3. Now some things I like in A3 over L3 Importing time. Took forever in L3 compared to A3 Far more intuitive layout. Every aspect of it. So far I think I like the sharpening in A3 a bit more too. Anyways, just wanted to share this bit of info, as I have spent more than my fair share of time bitching about A3s lackluster performance (In my experiences). Hopefully editing this gig will go smoothly enough to convince me to buy the full version and keep A3 around only for my old files. I have no desire to move everything over, but rather start using L3 over A3.