I bought the String Butler early December.

Firstly, I did as Tim stretched the strings and prepared them for several days early December as the strings evenly were out of tune. Not just the D or the G String, where the G String is normally the problem.

Now 2 weeks in I have no tuning problems.

I tested daily and compared to before with new strings I have far less tuning problem.

When I am playing I have even no tuning problems.

I would say the String Butler fixes the G String tuning problem. 

I shall continue updating this post so you can see how I progress.

The guitar is a Gibson Les Paul Studio 2016 T you see in the background.