We haven't actually used it yet, but based on initial examination, it looks like a good product.  Many years ago (I'm talking fifteen plus), we had something similar.  The problem with it was, it was kind of slinky like.  Meaning, when you pulled it out, it had the tendency to want to coil back up.  Right off the bat, this seems like much more durable plastic.  Secondly, and most important, each of the sections are hinged.  It stays exactly how you place it, and you can expand whatever section you need, turn a corner, and so on.  We are yet to field test it, but I am very optimistic that it will do the job.  Having something that supports the sewer line on a gradual downgrade will lower the chances of things backing up.  Trust me, there are "things" that you really don't want backing up.
We haven't actually used it yet, but based on initial examination, it looks like a good product. Many years ago (I'm talking fifteen plus), we had something similar. The problem with it was, it was kind of slinky like. Meaning, when you pulled it out, it had the tendency to want to coil back up. Right off the bat, this seems like much more durable plastic. Secondly, and most important, each of the sections are hinged. It stays exactly how you place it, and you can expand whatever section you need, turn a corner, and so on. We are yet to field test it, but I am very optimistic that it will do the job. Having something that supports the sewer line on a gradual downgrade will lower the chances of things backing up. Trust me, there are "things" that you really don't want backing up.