I bought my Mini this spring (Macmini3,1), this is the new model after the long wait during the "mac mini at end of life"-fear. For those having the same model, I provide a short list of findings of the first evening of using SL. For the others, some more infos are provided.
Upgrade or clean install?
I installed SL over my existing Leopard system with all private data backed up but left as is. As known from former system installations, the private data remained untouched and was perfectly safe. But you never know, I will keep my backup for some more days.
Things I noticed:
- Installation takes about 35 Minutes (I installed everything)
- long spinning wheel at first and second start of Finder
- WakeOnWLan seems to work.
- Does not boot with 64kernel (as expected, and not need for it).
- There is a Firmware-Update for the Mini right at the start. Turn off and back on your screen if it keeps being black after the indicated 40 seconds.
In the other thread, there was this OpenCL-benchmark-thingy. I tried it just because I wanted to know if my graphics card is capable of the things apple promised. It looks good:
Number of OpenCL devices found: 2
OpenCL Device # 0 = GeForce 9400
Device 0 is an: GPU with max. 1100 MHz and 16 units/cores
Now computing - please be patient....
time used: 3.505 seconds
OpenCL Device # 1 = Intel(R) Core(TM)2 Duo CPU P7350 @ 2.00GHz
Device 1 is an: CPU with max. 2000 MHz and 2 units/cores
Now computing - please be patient....
time used: 18.194 seconds
Now checking if results are valid - please be patient....

Validate test passed - GPU results=CPU results
Other things of SL which I noticed:
- Font-AntiAliasing can be set to non-LCD-style which is the smoothing formerely refered to as the CRT-style. My concern was that unchecking the checkbox would turn off antialiasing completely.
- Zoom per scrollwheel changes the default behaviour but can easily be reset.
- Mail (once again) sets the "new-mail"-sound per default but can easily be reset. Hope my preferences will stick in the future.
- The ColorSync profile for my screen had changed, but can easily be set back.
- XCode 3.2 uses antialiased font as default. Can easily be changed back to monaco 10 (for those who like it more).
- Screen capture in QuickTime X can only record fullscreen.
- The clock in the menubar now shows the date with an ugly abbreviation-dot.
- SoftwareUpdate is a little nicer.
- You can get spotlight to search in the current folder by setting it in the finder preferences.
- Console Application does not properly reload files. But at least they are displayed correctly when they are just plain text.
- Text Edit now has a useful feature to remove ligatures in texts.
- Preview offers soft proofing,
we'll see how it performs.
- The sidebar in the finder windows finally don't show things you did not explicitely want to!
- The quicklook-index still does not work in fullscreen mode. I muss that feature from Tiger so very much!
- Dragging multiple selected items in list view now also works when clicking the mouse pointer on an empty space of one line!
- Opening Applications and Utilitites folder still takes some seconds to load.
- The view of a window still spreads to every newly opened window and will not be stored for one particular window.
- When in QuickLook mode, you can double click the document and it opens. Was that before in Leopard?
- The processor use always looks very! balanced, the two cores are used equally. This is impressive.
- Safari finally smoothes the favicons correctly.
- Safari did not crashed once yet. Flash seems to work, but the processor load is pretty high.
- Printer driver works perfectly.
- The Services-Menu now only shows Services which are available. Although, I will continue to forget that this menu exists and therefore not use it anyway.
- Apache (Web) did not worked at first. The php5_module had to match the apache installation which was overwritten somehow by the SL installation.
- Mysql nowhere on the system??? Downloaded the x86_64 package. Installation without problems. But the data has gone. Well that's why we have backups, don't we?

- My latex installation works.
So far so good.
Overall, as expected, SL is almost completely the same as Leopard. As I do not use much of third-party apps, I have no problems at all. Some small things changed, but I think, the real benefit will come with time.