Product review (2 stars): Like others have said the outer dimensions of the line ...
Like others have said the outer dimensions of the line was not large enough to make a seal so there is a slow drip at the saddle valve and the line pops off at the control valve from the pressure. Not surprising since the line can easily be pulled out by hand even after really cranking down the connector. Off to go get some copper line and better connectors.

Edit: I gave this kit an extra star due to the fact the valve actually works fine and even at this price it isn't a terrible value. Similar parts are a similar price at the local big box store.