Since late February when the trial version of Aperture 3 was released I've been using Aperture 3 a lot. I have to say that I am both dazzled by its' brilliance and outraged by the sluggish performance and crashing.
On the positive side, the brushes feature in Aperture 3 is my favorite feature. I may upgrade to Aperture 3 just for this feature and the ability to manage video files. The brushes are so easy and intuitive compared to Lightroom brushes that there is no comparison. In Aperture the brushes just work like you'd expect brushes to work. I've never read an explanation of how they work. Everything about them is obvious! I love them. On the other hand, Lightroom brushes are so wacky I have to go read a description of how they work every time I try to use them. I've even watched Chris Orwig's demos on Lynda.com and I still can't remember how they work. The way they work is just not intuitive to me. I don't know what they were thinking when they designed Lightroom brushes like this.
On the downside, Aperture 3 is so slow and sluggish, it tries my patience. When I first tried it, I was using it on my 3 year old MacBook Pro that only has 2 Gig of memory. I moved to my newer MacBook Pro that has 4 gig of memory. It's better but Aperture is always doing something in the background and the brush operation is at times jerky and erratic. Aperture 3 is the only application I've encountered that is sluggish on my newest MacBook Pro. I love the Aperture 3 features so much I'm thinking about upgrading my MacBook Pro to 8 gig just for Aperture 3 to play in.
My other big issue is with video files. All of my primary cameras capture video files and I am tired of trying to manage different files that come off the same memory cards separately. It's time that photo management software managed everything that comes out of cameras! Are you listening Adobe? I swear that if the Lightroom 3 final release doesn't manage video files I'm walking away from it. I've got all my photos back to 2000 in Lightroom so it will be a lot of work but I can't continue living with photo management software that can't manage all the files that come out of my camera.
The real benefit for everyone with this current situation where much of the functionality of Aperture has caught up with Lightroom is that both Aperture and Lightroom are going to be better as a result of the competition between Adobe and Apple.
Sorry about the rant, but I just had to get this off my chest. I feel much better now.