First, it is easy to install. I did not even look at the instructions it is so intuitive. If you are even a little handy it should be no problem.
The difference in comfort both my wife and I found by moving the handle bar closer is substantial. We both seem to perform better with the seat back but it puts us far enough from the handle bars to be uncomfortable. Problem solved.
While we have only had for a short time, it is apparent the adjuster is well made. Can’t foresee any issue with build quality.