The Good: Strong, stiff, nice neutral geometry, head treated and ED coated, lifetime warranty
The Bad: Heavier than some NS frames
I've had frames from Specialized, Snafu, Black Market, and NS, and my friends have owned most every other brand. This one is far and away the strongest and stiffest I've ever had - only frame to last over a year. The lifetime warranty inspires a ton of confidence. It's a huge bargain considering the features it has, with post-weld heat treating and ED coating, the directly comparable frame is the NS Majesty (which I cracked in 9 months), which retails for over $100 more and has a much shorter (one year vs. lifetime) warranty.
The geometry is fairly neutral, with shortish stays, a roomy TT, and no BB rise. It's still incredibly easy to move around and if you're tall like me, the front end is the perfect length. If your ideal street ride is all about flickability and twitchiness, you'd certainly be better served with an NS Capital, however if you go fast or big, the stability the Streetsweeper brings to the table is essential.
Since I've owned mine several of my friends have since switched over as well.