Someone asked me on Facebook why I don't think it's the right time to upgrade to Aperture 3 from Aperture 2. I thought I'd share my opinion here.
At this time, I personally don't find it feasible to upgrade, especially with reports of it slowing down/crashing for users if you have anything 4GB or less. It's 64-bit, which makes it easier to add & utilize more RAM, however, this means you will need to purchase what?...More RAM because its made to utilize it knowing it will require it. What a conundrum. Another pain right now is migrating your A2 libraries to A3. If you try to do the entire upgrade in one go, it takes a crap and no one knows why for now. I guess the other option would be try migrating one project at a time, but boy that's gonna take up some time if you've got a bunch of those. It simply will not run fast enough or crash when on a MBP running at 4GB when you've cropped at 100% to edit a photo. So either upgrade the RAM or buy a new machine.
These additional stresses, headaches, & costs need to be considered and should probably be listed under *System Requirements* with "$99 for Software Upgrade Fee, Additional Hardware Costs Required, Motrin Optional." Best thing to do: Wait for all fixes or version 3.1, try a 30-day trial of v3, or explore other options such as Lightroom or Lightroom 3 Beta.
In closing, I see far too many photographers and independent businesses get sold on the marketing sheepdom of buying the latest equipment and the latest software. If you were running a 50-employee company all using the current software, you would make more logical assessments based on hardware/software requirements and costs for all 50 people. If you have to upgrade the hardware in addition to the software, you're talking more money regardless. You have to think like this even if you are running a one person studio. If you're in business, think and act like it.