A little Sway Bar history....
Not sure what year (let's guess early 2009) Evoluzione came out with a sway bar for the GS/RS Spyder. I bought one and so did many others and they got rave reviews. When EVO went out of business (guessing again, but let's say sometime in 2011) and the supply of bars eventually ran out I started to get owners contacting me about making sway bars. A few knew that I had started a sway bar project early on but EVO was doing the same thing and they beat me to production and I didn't want to compete.
I re-started my RS, GS, RSS sway bar project in the spring of 2012 and ended up producing the current bar for the 2008-2012 RS, GS, RSS Spyders. It is stronger than the EVO bar and most are very happy with it. But I think perception has changed over time. Here is what I think has happened.
When developing the current 2010-2012 RT, RTS, RT Ltd. sway bar I decided to make it quite a bit stiffer than the OEM bar. After all, the RT really needed more help than the lighter, lower center of gravity RS, GS, RSS model. The difference is so dramatic for the Pre-2013 RT models that people purchasing the Pre-2013 RS, GS, RSS bar then started to expect the same HUGE difference that was being reported for the RT model bar. So, what used to be 'Impressive' became 'Subtle' to some owners.
Now that the 2013 sway bar projects and the Heim Joint Links are done, and understanding that 'Beauty is always in the eye of the beholder', I am considering an upgrade to the 2008-2012 RS, GS, RSS sway bar. I have been running a stiffer bar on my 08 GS for some time. It was a prototype that I thought might be too stiff for some riders. It really gives the 2008-2012 RS, GS, RSS a flat ride in the corners and is very impressive.