ArsTechnica posted a review on Aperture

Apple has cojones. Let's not pretend otherwise. Jumping headfirst into the fully mature digital imaging market requires the shameless bravado of a one-legged man at a butt-kicking contest or any number of contestants on So You Think You Can Dance? What's at risk is not only cold, hard cash, but more importantly, their reputation as a software innovator. With Aperture, Apple is clearly hoping to have the same success it has had with Final Cut Pro. Plus, becoming a household name in imaging can't hurt the bottom line for hardware sales.

Aperture hopes to do this by edging its way into the workflows of professional digital photographers by being basically an iPhoto Pro

Aperture Review