I'm pretty sure that Cobalt Cables and Straightwires are unaffiliated.
Now as far as my opinion about Cobalt Cables...solid product, that performs well and looks pretty. Not the best ROI in relationship to raw performance.
First you must ask yourself these questions.
1. How important is performance?
2. How important is looks?
3. How much more am I willing to pay just for looks?
If your only objective is raw performance you'll get a better ROI by purchasing something from mononprice, and if you want all out performance go bluejeans.
If looks are important and you like the looks of Cobalt than you cant go wrong. Just beware that the extra scratch that you are spending is for the looks not the performance of the cable.