One of the things I like about it is that because it's flexible, if you route it carefully you can avoid using connectors in a lot of areas that rigid pipe would require a joint. The way I saw it used, the only joints were in areas like cleanout access and crawlspaces, so even if a joint went bad, it wouldn't require opening up a wall to fix. I'm not a pro, so maybe rigid pipe is supposed to only have joints in accessible areas too, but that certainly wasn't the case with the century-old plumbing I saw.

It's still relatively new compared to other pipe material, so there may be some other surprises that crop up with long term use, but I'm really impressed with its ease of installation.