Don,
Do not get me wrong ... in fact I have moved a great deal of my workflow from Lightroom to Aperture ... specifically for slideshows and books ... when you discuss improving those modules or users ask for new features like Face Recognition to be added to Lr on the Adobe forum ... you get the same song and dance that adding such features are unimportant to "professionals" and adding or improving them would only dumb down the product for consumers ... which I believe is far from the point. As I stated in an earlier post, I really don't care what others think about UI tweaks or features they don't use ... I only care about results. Period. I'm far too busy to spend my time in trying to determine who is a pro ... who is a consumer and which features are for whom ...
Aperture and Lightroom were both first developed and offered as workflow solutions. Solutions where you could take great numbers of RAW images from capture to completed export/print with ease and without the need to generate a mountain of derivative files in order to get there. Lightroom certainly does not corner the market in this sense for a great many users.
There is absolutely no way to create a custom page size or template in the Lr Book module. So unless you want to only use Blurb as a source for books, the whole effort by Adobe is completely useless because the templates offered are only in Blurb sizes ... no way to create the sizes your pro print labs may require. Everyone like to consider Apple as a "closed" garden ... but Aprture 3 has had custom page sizes for Books from Day One.
If you want to create a slideshow in Lr, you can only use one intro and one ending title slide, you can only use one transition, one music sound track and you can not include any video clips ... if you need extended length audio, you have to edit and join them in software outside of Lr. You can't access your playlists, nor can you control the volume along a timeline or add voice narration or ducking via a timeline like you can in Aperture.
I'm sorry, but that is not a solution for me. I've been a full time photographer for 38 years and have seen a lot of technology come and go over that time. I have no blind loyalty to any single developer. I merely want to do my job as best as I can without drowning under a mountain of image files I don't have to create in order to bounce around between a half dozen apps to get the job done. For me, workarounds are not solutions, it's just more work ... Currently, while Lightroom may seem like it is far ahead of other options ... in some areas, it still hasn't left the starting gates. Which is why I am split bnetween two worlds.
I'm just growing impatient waiting for Apple to up the anty and show me more of a reason to move my complete workflow to Aperture. In return, I'll gladly turn over any reasonable amount of currency in exchange if it answers my needs.