Absolutely love this thing - I run a small instrument repair workshop so I'm putting on new strings and stretching them out fairly often and that's where this tool shines, it's become an essential tool to me and as the title of the feedback says - it saves hand pain, when you have to stretch 3 guitars by hand for customers collecting them that same day it is very painful and this eliminates that completely, the main drawback to it is that bass strings tend to grind it away a little bit - not too much but it definitely shows signs of wear after about 10 basses, it does wear away with wound guitar strings but it's not as noticable and the tuning stability is unbeatable assuming all other points causing tuning problems are sorted - e.g. nut etc. if this one breaks I'll definitely buy another one as theres no way I can go back to doing it by hand after experiencing how amazing, consitent and easy it is to use