''i would recommend to go with 4 GB as recommended from Apple, I installed 8 GB and didn't noticed significant difference.''
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Whether or not more RAM will benefit you depends completely on your usage. I have my Mac mini maxed out at 8 GB, and I wish I could stuff more in there--I get a lot of pageouts, depending on what applications I have open. In general, it behooves one to install as much RAM as one can afford. Especially if one uses Adobe or other memory-hungry apps.
Whether or not more RAM will benefit you depends completely on your usage. I have my Mac mini maxed out at 8 GB, and I wish I could stuff more in there--I get a lot of pageouts, depending on what applications I have open. In general, it behooves one to install as much RAM as one can afford. Especially if one uses Adobe or other memory-hungry apps.