Still my #1 choice for my photography: wide gamut, true calibration, friendly pixel density.
Mac Pro Westmere RAW-file Import with Apple Aperture 3
Apple Aperture 3.0.3 Import
Aperture performance is slightly slower than Lightroom 3. Results are about 1/3 slower if the face detection setting is enabled.
Note that 12 cores is only 8% faster than 6 cores— Aperture does not scale.
Aperture 3 is not using the available CPU cores as well as it ought to.