The Mirror Component(s) tool in the Assembly environment was completely redesigned in the 2010 version of SolidWorks. At that time, the improvements were considered spectacular and the benefits huge in comparison to how the mirror command worked in the previous versions.
Starting with SolidWorks 2010 mirrored components are uniquely located in the universe of the main assembly, based on the position of their parent and of the reference plane used for mirroring. The user has full control on deciding which components need opposite-hand versions and which ones need just re-locating in a symmetrical position in regards to the selected plane.
There was only one thing that SolidWorks 2010, 2011 and 2012 did not do when mirroring sub-assemblies and that was carrying over any mates referring to the origin or the default planes of the original sub-assembly. At best, after mirroring, the user had to spend extra time to edit the new sub-assembly and manually add those mates. At worst, the user did not even know that this potentially dangerous situation existed!
SolidWorks 2013 finally solves this problem. Watch this video for a comparison between the Mirror command used in SolidWorks 2013 versus SolidWorks 2012, and how to SOLIDWORKS Mirror with All Mates
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