^ the mottling is very minor. It can also be fixed if you want to take it apart and delaminate the LCD (not as hard as it sounds).
As for the SSD, i have fitted three of them now in different macs and it't pretty simple if you have the right tools. The best guide on how to do it is here: http://www.ifixit.com/Guide/iMac+Intel+20-Inch+EMC+2133+and+2210+Hard+Drive+Replacement/1008/1
@Soul started
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^ the mottling is very minor. It can also be fixed if you want to take it apart and delaminate the LCD (not as hard as it sounds).
As for the SSD, i have fitted three of them now in different macs and it't pretty simple if you have the right tools. The best guide on how to do it is here: http://www.ifixit.com/Guide/iMac+Intel+20-Inch+EMC+2133+and+2210+Hard+Drive+Replacement/1008/1