Upgrading iMac OSX Lion to OSC Mountain Lion. Bad idea?

I've heard that some people have had lagging and freezing problems with there upgrade to Moutain Lion.
I have a iMac OSC Lion. i got for christmas in December 2011. So its almost been a full year with this computer, and i dont want to slow my computer down.
Should i upgrade it?
Yes i am planning on using the new apps or the apps i dont have on this mac or certain features, i just dont want my mac to be lagging
and freezing and not running slow.
Any tips?
This is my first mac(:

Well, only you can decide for yourself, but I can tell you a little about my experience...
I have a MacBook Pro from late 2011, and it was running Lion (10.7) when I got it and has been all the way up until this week. I was working on a project that didn't finish until mid last week, and I wasn't about to upgrade this machine in the middle of that project (although I did upgrade my late 2007 MacBook Pro to Mountain Lion as soon as I got it). In general, my 5 year old computer is just as fast (or maybe just a bot faster) running Mountain Lion as it was with Lion. It upgraded without a flaw, and has been workign great for me the whole time.
My 2011 MacBook Pro was a bit of a different story... When I first tried to upgrade it to Mountain Lion last weekend, it hung in the first reboot after the installer had copied everything to the HD. I restored from my backup (taken minutes before the upgrade attempt was started). Over the next 2-3 days, I went through the install process probably 8-9 times before I finally get a working system. I had deduced that the "hang" was a compatibility issue, eoither with hardware, or with some software that runs at a very low level. After swapping the RAM back to the "stock" RAM which came in my MBP with no change, I determined it was most likely software. I tried uninstalling VMWare Fusion, Parallels Desktop, etc. Nothing "fixed it". Finally, using some diagnostic tools I found an old piece of software I had installed 2 years ago that seemed to be causing the hang. After removing that, the install went flawlessly. For the first evening, my system seemed a bit slower, but Spotlight was updating all of its search history, and ever since then, the machine has been great. I can't tell any difference between 10.8.2 and 10.7.5, other than 10.8.2 "seems faster" (now).
If you make a good backup of your system using a toole like SuperDuper, or Carbon Copy Cloner, you can upgrade and try it out for yourself. If you are not happy, you can restore your backup fairly easily, and be back to your older OS version. I made my backup on a bootable external drive, and it only took about 30 minutes to perform a restore if needed...

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Upgrading iMac OSX Lion to OSC Mountain Lion. Bad idea?

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