I read a lot that says doing so, ensures a clean install and best 
performance. I really don't want it to make my MBP early 2011 lag (Lion did 
a wee bit over SL).

Any ideas on how I do it? I run TimeMachine to an external drive, so will 
it be an easy backup to that, then download the ML to a USB drive and run 
the installer from that?

Any help greatly appreciated! BUT, if you think it won't impact peformance 
and I should just update, please do say!

Any other first impressions?

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