Here is my experience with S2D:
Rock & Republic -- described above. The workmanship (made in USA) is excellent in this pair but the wash is gross. I think it was mislabeled as having 2% spandex (also in the RueLaLa description) but it clearly does not have any stretch at all, fabric feels like Wranglers jeans.
7FAM -- the stitching on the back pocket squiggle design is not as tight as w/ regular 7's. Also, the fabric and wash was quite inferior. The pair were made in Mexico; workmanship was good. I returned them because I did not like the wash.
J Brand -- Just got a pair. They are called J Brand "Blue Label." The fabric & wash are really nice. Workmanship is very good. Made in the US. Got them for around $50. Trying to decide if I should keep them because they're a little tight (lots of Xmas chocolate and cookies!)
Generally I prefer the regular, non S2D jeans but my strategy is to wait for sales. I have a lot of 7's which I have purchased at the 7 store in San Francisco. They have an annual anniversary sale when everything in the whole store is marked down 40% for a few days. That's when I will buy 4 or 5 pairs. Likewise, I have found TR's on sale on the internet. You have to be quite patient and feel ok if something you really want does not become available at the price you are willing to pay. I used to shop on Ebay but it's been a while. So this is my jeans shopping strategy!