if i could remember where it was, i would post a link to the actual post by dave@cobb or josh@cobb, but from what it said, cobb designed their sway bars independently, but did not have the manufacturing capabilities in house, so they sent the design to hotchkis for bending. i am pretty sure the cobb sways came out first, so i'm not going to speculate on why the hotchkis are so very similar to the cobb sways (just thicker).
the reason i got the cobb sways is because i got the cobb stage 2 suspension package, which saved me a bit of money for getting the sways + springs together. i wanted the cobb springs is because:
1. moderate drop (1" in front and 0.9" in back)
2. well thought out stiffness settings (+15% in front and +25% in the back)
3. more comfortable ride than the other options out there
i was especially drawn to the staggered spring stiffnesses + drop levels, because it stacks the weight of the car a bit more to the front, which gives a bit better traction and wheel hop reduction on launch. the moderate drop also allowed me to avoid getting camber links, which saves me another $200+.
i have actually only put in my springs + rsb so far. i didn't not do the fsb yet because it was freezing cold when i put in the springs + rsb and i got terribly sick because i was rolling around on the driveway in the middle of the winter...(doh). since then, i've been slacking and just haven't gotten around to putting in the FSB yet. i am very satisfied with my springs + rsb, though. my car does not wheel hop at all anymore (combo of springs + MM) on stock tires, and this makes me VERY happy...

the car settles down faster when going over undulating bumps, so the "floatiness" i felt before at high speeds is definitely reduced. as far as cornering/handling goes, i honestly don't remember what kind of body roll i had before this, but i DO know that the car rotates its rear end noticeably more readily now. i'm not going to pretend that i'm some kind of racing expert, but i do believe the car just feels more responsive and connected to the ground overall.
so, in summation, as far as the performance of the products go, i am very satisfied with what i got for my money. as far as customer support goes, i have nothing but good things to say about the people at cobb. i spoke with chris@cobb on the phone several times to get install advice and to get help working out a squeak that i was getting in the rear (which turned out to be interior panel/rear seat related). he was very helpful and walked me through the questions that i had.
anyways...that was just my 2c...=d