I've been running it for two weeks now. There were some weird video display issues on a MacBookPro when unplugging from an external monitor to begin with. But these have stopped all by itself... hmmm...
Only other issue I have is XCode 4.4 has got problems with subversion.
Overall, it's a pretty nice upgrade, mostly polishing up the 'rough bits' in Lion. e.g. iCloud connectivity.
Nothing in particular. Just follow the usual advice.
1) Backup before installing.
2) Check backup works.
3) Check your Mac is compatible.
4) Check any software you depend on is compatible or has recent updates. Check out RoaringApps.com
5) Check any software you have forgotten which 'customises' your Mac or does 'low level' stuff. (Like AppleJack) is compatible.
or you could 'throw caution to the wind', ignore the above, cross your fingers and go for it anyhow! It's more 'fun' that way... ;-)
would you suggest doing a clean install or installing over Lion
Try to keep things simple. Installing over Lion should be fine providing you've not got any old 'low level out of date software lurking in your current Mac.
Photoshop Elements 6 is getting seriously long in the tooth... (5 years+ old designed for 10.4). However, surprisingly, here's a link which states it is possible to run it under Lion. There's an even chance it might run under Mountain Lion, but be prepared for possible disappointment.
Come now, Martin - even my grandchildren don't regard 5 years old as 'long in the tooth'! As iPhoto improves, we find we use PSE less and less, but still would be reluctant to lose it. If I remember right, PSE6 was an enforced upgrade from PSE2 when Leopard came along, so PSE6 has seen us through Leopard, Snow Leopard and Lion but I am hoping it can survive one more big cat.
Come now, Martin - even my grandchildren don't regard 5 years old as 'long in the tooth'!
Based on that logic, I'll just pull out my 128KB Macintosh and regard that as a usable machine. After all it's just 26 years old, so it is in the prime of it's life compared to a human! :-)
Adobe has long abandoned PSE 6 for versions 8, 9 and 10.
Since 2007 we've gone from 10.4 to 10.8, PowerPC to Intel, 32bit OS to 64bit OS as well as numerous complex changes of the underlying OS and Finder.
We have Macs from 2008 which are no longer supported by Mountain Lion (Mac Mini, MacBooks), there are even Macs from 2010/11 which cannot support all the new Mountain Lion features.
Now don't get me wrong, there are plenty of useable Macs running great software older than 2007. I have quite a few myself. PowerMac G5s are a good example of this. But since currently supported applications often need a 'tune up' for an OS upgrade, all I am saying is just don't get your hopes up running old unsupported software like PSE 6 on the latest Mountain Lion without at least a few niggles. Then again, you might get lucky.
Well I took the plunge and set the iMac downloading last night, it being the end of my broadband quota month. Woke up to see the clock radio flashing 12.00 indicating we had had a power cut! Sure enough, the download had been interrupted. In spite of the untidy power down, the IMac started up as usual and I was able to resume the download from where it left off.
Installation was straightforward and so far all the Apps tried have run ok - including PSE6 :) So far Lion is remarkably unremarkable but I look forward to getting to grips with a few of the new features in due course.
Have taken the plunge and updated to Mountain Lion. Did a clean install by downloading Mountain Lion and then used a program called Lion Disk Maker to make a bootable USB Drive. I restarted the Mac holding down the Alt key and selected the USB drive erased my HD and then installed Mountain Lion and brought all my information from a Time Machine backup, and so far all seems alright
I have had no problems with Mountain Lion (now running on both my 2009 MacPro and my brand new 2012 MacBook Air).
I took the usual precautions (made sure TimeMachine up to date before starting, made a SuperDuper clone immediately before the download, etc), and found that the upgrade ran very smoothly on top of Lion. Didn't bother with a clean install this time, and I cannot detect any difference.
I haven't exactly pushed the OS's boundaries yet, but so far I'd say it appears to be what Lion wasn't quite (at least on release).