Mid-2009 13" here ... running strong on Sierra after SSD and RAM (and 2nd HDD in optical bay) upgrades 
One of the internal speakers has been damaged and puts out distorted sound, but I use headphones exclusively, so not a problem.
Battery has been awesome too ... 960 cycles (max 1000) and it still hasn't given out on me.
Had to replace the MagSafe adapter recently because the cable got overstressed at the business end.
Oh, and the keyboard has an 8 year history of foods I've eaten and other residues from my fingers. Basically a wealth of forensic information if anyone wants to know what I do around the times I use my MBP.
One of the internal speakers has been damaged and puts out distorted sound, but I use headphones exclusively, so not a problem.
Battery has been awesome too ... 960 cycles (max 1000) and it still hasn't given out on me.
Had to replace the MagSafe adapter recently because the cable got overstressed at the business end.
Oh, and the keyboard has an 8 year history of foods I've eaten and other residues from my fingers. Basically a wealth of forensic information if anyone wants to know what I do around the times I use my MBP.
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