I bought a Wise 2086 Electronic Pro. Head Tensioner to upgrade my mutual power titan crank stringing machine and its definitely worth it. The add on comes with a diablo drum which takes 70% of the stress off the strings while tensioning. It strings nice and easy with options of constant pull or lock out, LBS or KG in tenths, and a pre stretch option. It's believed to be one level below a babolat star 3. This is a great investment if you are planning to open up a tennis shop or are stringing more than 100 rackets per year.