This item does what it say but unlike some other of Park Tool items it's not great.
The locking mechanism can easily pinch the bare strands and this leads to unwinding. I think there must be better versions of this tool so I'll be checking vehicle and electrical tools for my replacement.
However it is better than nothing and it's pretty cheap for what it does.
This is another tool that falls in the category of not used often but indispensable when it is. Works great on my front center pull brakes that seem to always need adjusting. Not as useful on my rear brakes due to space constraints. not hard to justify the cost with a family of four with six bikes.
You'll use this for about 10 secs. for each brake and derailleur cable at the end of a cable/housing replacement job, but it eliminates a lot of wasted time and frustration, and helps to get the cable tension/placement just right.
Wait for the sale, then buy it. I own eight bikes and ride everywhere. This tool is a real time and labor saver for me. I am constantly replacing and adjusting bike cables. I should have bought this tool year ago. If you adjust cables you love this tool, a very useful gadget.