Smaller then they used to be
I purchased a set of these in May 2014 and they've been serving me well for almost three years, until I finally lost one of them.  I just got the replacement set and immediately could tell they were smaller.  Its only about 1/16 of an inch difference in diameter (old version is the left/first picture), but just enough to feel less secure in the ear.  Still need to try them out at a concert, but I'm worried about them staying put throughout the show.
Rating: 3 stars