I've upgraded to Precise last thursday (the day it was released) from the update manager.
There are some things that work better. I could install and run Digikam (which I couldn't in 11.10), and run apps like gnome-tweak-tool (which didn't work with my 11.10, I don't know why).
It's also great to have some updates that weren't available before.
First, there's a little problem with Unity, which someone already described here
The hide/unhide dock features is not working well. That's enough to make it almost unusable. Anyway, I usually use Gnome-Shell: lots of extensions aren't working, but probably it's just a question of time for them to be upgraded.
But the worst: wehn running LibreOffice, it's really, really slow. I'm working on a big file (more than 200 pp. with some images) but, before, it worked smootthly.
Now, it's really too slow. If I delete a word, I have to wait three to five seconds to see it on the screen.. not to mention scrolling and refreshing the text when scrolling just one line below!
I also tried it with the lightweight desktops (Lubuntu and Xubutu) which I have installed. But that's the same!
First, I thought that it was because I installed Tracker. But I stopped all the Tracker processes and it all stayed the same. I didn't unistall Tracker, however. But I'm affraid it's not from there.
This made me return (Temporarily, I hope! ) to good old Mac OS, always working. Which is a pitty, because I became fond of Ubuntu and open-source software.
So, does anyone find that Precise is slower (much slower) with PPC's? Is there a reason for that?