Upload & Sell: Off
Some good points well made.
My 'personal' library is now around 1TB in size with 59,621 files in it. I bought Aperture at v1.0 after seeing it at an Apple show prior to release. I've been adding my personal files to the same collection ever since, with files dating back to 2002. I store things mainly by year, then project.
Professional shoots are stores as separate libraries.
While the main library has certainly slowed 'a little' over the years, probably due to the ever increasing size, it's actually still faster to use than a similar number of files in LR. I tried it. Bad mistake. LR fell apart and took forever to find things.
I also have TWO Aperture Vault HDDs, backing up to both after any significant addition to the Aperture library. It only takes a few minutes and it's done. LR has no such feature.
I do agree on the Canon vs Nikon side of things. Aperture does a great job of Canon files and a perfectly acceptable job of Nikon files. But then that's my feeling on LR as well. Nothing gets those Nikon files as good as NX2. I should perhaps add that I've had every version of LR too, from the it's pre-release beta to the LR5 Beta. It does some great things but it's not a serious DAM in my opinion, it's good at what it does, but it's got some things that drive me nuts, and right now Adobe are going to struggle big time to get any more of my money.
In terms of printing (mentioned above), I've printed from both LR and Aperture and both have their foibles. If you give up at the default then it's your own fault. Both can do an amazing job and I've had several books printed from Aperture and absolutely zero complaints. Even my clients love them.
Aperture is a great program that is barely touched by most people. Lynda.com has some good tutorials on using Aperture so if you're new to it, pop along (I think they even have a free 7 day trial) and learn how to use it beyond just the basics of randomly clicking to see what happens.
Like many, I'm eagerly awaiting Aperture 4, but then I'm also eagerly awaiting Logic Pro X too