The TRD springs are better than stock, but nothing to get excited about. My point is that I have another car which is 7 years older, was cheaper to buy new, and with nothing more than a TRD RSB and strut bar, but will out-handle my Corolla with the RSB and spring set.
Both are running stock size tires, but the Scion is probably a better overall design than the Corolla - it's roomier and handles better. Had they dropped the 1.8 into it, instead of the 1.5, it would be the ideal platform for a cheap car to do some weekend racing or just eating up twisty roads at irresponsible speeds.
Someone else mentioned that Toyota should have made the springs and RSB standard on the S model. And I don't disagree. Their inclusion now makes it handle as I would have expected from the factory. I've put $815 (including lifetime alignment) into my suspension now, and it was only the first $155 (RSB) that made much of a difference.
Which brings me to my next question. Is a strut bar going to stiffen things up, but induce more cowl shake on bad roads, or will it quiet the ride a bit? I don't want to hear and feel every bump.