I have ridden the 2012 RS & RSS as well as the 2013 RS & RSS and I own an ST. I bought the ST because I thought the 2013 was an improvement over the previous lines...not just the positioning, they literally successfully blended the touring of the RT with the sport feel of the RS/RSS. Brembos are a dramatic improvement over previous models, but it only starts there. Totally dig the Zumo nav, radio, windshield, etc.
For the record, I have had ZERO problems with the ST electronics. I have, however, had problems attributed to the 2013 ST lineup, but EVERY make/model BRP has made has had some problem attributed to it. Not all ST owners suffered what I did, and my woes were quickly adressed by my dealer & BRP. Overall I am a satisfied ST owner & would recommend others at least test ride an ST to decide for themselves. I think you'll find a lot of varying opinions...and my personal opinion is that the ST is a step up from the previous year's models...Brembos have already saved my skin, as I have had some numbskull turn in front of me while i'm at speed probably once every couple of weeks since owning my bike. Brembos slow down and stop on a dime; hands down. I have to say that I ride my ST like a sport bike moreso than a touring bike (when i'm 1-up without my son or girlfriend, that is).
Brembos are in my best interest. My next purchase will be a BajaRon Sway bar now that they're ready for the 2013 (I think), then an exhaust (One that'll fit with my ST saddlebags). I am trying to walk the line between responsible weekend rider, and performance demanding enthusiast. The ST allows me to do just this...IMHO, of course.