When the ST series was introduced for 2013, it was positioned as the "sport touring" model in-between the "sport" RS models and the "touring" RT models. That said, the calibration of the ST (IMO) was biased far more towards the RT than it was the RS - it was set up more for ride comfort and touring than it was handling and responsiveness.
So when I got rid of a 2008 GS and upgraded to a 2013 ST-S, the seating position and ride comfort sure was nice but oh boy how do we get back some of that handling? First thing was to install the BajaRon sway bar. It greatly reduced the lane wandering and body roll, bringing the overall calibration back towards the GS/RS sport models. Very nice improvement, great bang for the buck.
But now when I ride a GS/RS and then ride the ST-S, you can still tell how the shocks could also be better. One has to believe this is why the changes were made to the 2014 ST models, to reflect what many of us have been saying about the 2013 ST calibration. This is really less a matter of right or wrong than it is one of personal preference. Many of us want an ST to have more "sport" and less "touring" in the calibration, yet maintain the riding position differences between the RS and ST models.
I just ordered a set of the Fox shocks for my 2013 ST-S, not because I love Fox (they are really not that good of a shock on sleds) but they are better than the gas cell cheapies on the 2013s and I can get them for way less than a set of Elkas, which admittedly would be superior. From all of the previous posts I can find, those who have installed the BajaRon sway bar and then the Fox shocks have been happy with their investment. Some actually first installed the slightly larger than stock sway bar that came with the Fox shocks (sold as a kit), and then upgraded to the BajaRon bar.
All said and done, I believe most 2013 ST riders would find the BajaRon sway bar to be a great improvement and an excellent investment. If after this they still want more, then take it to the next level.