Dave Girard reviews Apple’s Aperture 3 in Ars. Bounce to page 7 for the summary:
For pros who just want to get work done, Aperture 3’s improved interface, flawless curve adjustment, multiple maskable edits, and 64-bit update are more than enough reason to upgrade. Add the metadata improvements and the high-ISO RAW conversion, and you have an essential upgrade. If Apple can rein in the glitches, give pros a toggle for the gooey effects, and polish the masking tools, then the rest is just gravy.
The verdict in fewer words:
So good that I’d put up with the crashing to use it
I ran into the same slow and crash problems from about 10,000 photos.