Bought a couple when they first came out thought they were a good idea.
But first time i used one whilst playing a fish the line parted at the connector, as this had never happened to me in the past i thought it must have been a weak batch of line.
Tied up new rig with different line and whilst play the next fish the same thing happened.
On inspecting the connector found that it was as rough as anything in the line slit and had cut the line so in the bin they went.
And never looked at them since.
They may be better now but i'll never use them again.