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I swapped out the super drive (CD/DVD burner) for an SSD (initially a relatively small one to just hold the OS). I upgraded the HDD several times (started life as a 256MB HDD). This machine has a full compliment of ports with NO dongles needed! I upgraded the ram over time to its max 16GB. This machine was the last of the totally user repairable notebooks Apple made. Without question, a fine example of solid engineering. My daughter gave me this machine as a christmas present in late 2012.
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I am among those still using a mid 2012 non-retina 15" MBP.
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