I've used aperture and its a nice app 'cept the UI isn't immediately intuitive and some of the clicking/selecting/editing tricks have a learning curve and vastly annoying at first (example: you want to make a photo book, you click on one thing, it selects the whole page, you click again, it selects something else, click a little more precisely, makes you think you've got it, adjust something, and bang, you've just delete or added a new page/text/box.
can be annoying. I DO like it, it is very helpful, but just at first it can be annoying, I'd say, especially at the new price, and it being a UB, I'd go with it. Just make sure you spend a day learning it before you have a deadline and have to 'speed learn by error' etc. I hope this comes off the right way...
I like aperture,
it has some bugs
but worth it.