Aperture is not my choice at all, used Mac since digitalization/ film scanners etc.
If you have Canon why not test DPP, canons raw program , free of charge
I tried Aperture, having liked and used Mac OSes and SW since the first Macintosh in the mid 80s.
Aperture did nothing but crash, I couldn't even get started with it!
OUT IT WENT. Won't even consider it now.
Also holding at Mac OS X 10.6.7 or older 10.6.8 as latest 10.6.8 was warped; 10.7 and 10.8 suck harder with every update.
my system is now frozen because it works the way I want it to. no more updates.