Had my alignment done after a year of street and track driving. I never had any issues at the track with the stock specs but I wanted a bit more aggressive setup. My tech hooked me up with -1.0 front (-0.7 stock) and -1.8 rear (-1.8 stock) with a neutral toe. Definitely makes a noticable difference IMO, albeit not huge as I started at -.7 out of the box. Sure does explain why some people complain about the handling "issues" or lack thereof with the wide range of normal values (-0.4 to -0.9). I highly recommend at least checking it before jumping to any major suspension changes.