easy to install, reliable - if protected from harm, price is very competitive with other products, and so far the cheapies have not knocked it off and made it less so.
A lot easier especially in tall buildings with long runs. I am regretting using steel, the cost wouldn't have been much different but it would have been a weeks less work.
From what I have heard is, that you want to use additional Teflon tape, the little bit that is already on the fitting is not enough. Plus be sure to cut the tubing square.