Aperture's shipping, your thoughts?

Over the holiday weekend, MacRumors noticed that Aperture has begun shipping. Looks like Apple quietly updated their Aperture product site and the store with cutting edge graphics (pictured right) to let us know, and customers who pre-ordered are receiving their shipment notification emails.

It seems as though the professional imaging landscape is going to get very interesting, as Scott McNulty noted earlier this month. Adobe's product manager for Photoshop has even given Apple a warm welcome on his blog, weighing in on what Aperture could mean for the industry, also noting that Aperture isn't quite meant to be a Photoshop-killer. But what do you TUAW readers think: have any of you taken a serious look at Aperture as a replacement for your Photoshop uses?