OK here's the quick review.
Here's the packaging, I bought it alongside with B+W MRC's for my DA* lenses. Packaging is eh, not that it matters.
It's naturally curved like the Black Rapid RS-7 I had. I decided to buy this one to replace it because I needed my Arca Swiss quick release plate on my tripod mount and the Pentax shoulder strap goes onto the lugs of the camera instead of the tripod mount. Works well together. The shoulder pad is decent quality, not as padded as my RS-7, but the nylon or fabric or whatever it is is just as high quality of a stitching.
As you can see, it does indeed come with an X pattern. It's OK, decent quality.
The clips are hard and require slight force but not too much to release. It's much easier to clip them back on as they glide back into place. As far the fabric on the strap part near the end of the clips and not at the padded area, it's OK, maybe not good of a quality as I hope, it's like the regular strap except MUCH softer.
$20 bucks sounds about right. When I put the strap onto my shoulder, the pad stays in place but the whole strap itself moves up and down so the strap doesn't get lodged or stuck in the way of you shooting photos.