Saw another company with one. It looks like Stryker stole an idea from Ferno for a change.
I've used Ferno's equivalent, the LBS, and I'm not impressed. Most of that is because the ProFlexx stretchers it goes on are so badly designed and inconvenient to use, but the actual product has some problems too. The sides are difficult to fasten and have the same problem with pin wear and resulting wiggle room as their 35-A rails. Stryker's rail design is different, but their rails are also smaller and look less secure. The problem with adjusting the rail angle is that the rails still need to be nearly vertical in order to safely load it into a Type II or move around at all with it in, and even in a proper box, it'll be uncomfortable.