I have a Hitachi M12V . I bought it about two years ago and have had absolutely no trouble with it, so far. The only babrs I would throw at it is that Hitachi only supplies one wrench for the collet and none for the spindle (uses a sliding spindle lock). That caused a few bruised knuckles till I recently went to the two wrench system. The other barb is the built in Porter Cable guide bushing adapter brackets, that cannot be removed and somewhat limit the size of your bit. Haven't found anything that bogs this router down and I just finished building a cellar stairway for my daughter. Not as fancy as R & B (did not rout in the treads), so I am satisfied with it. Know little about M12V2.
If you never made a mistake, you never tried anything