Had fought off the need for one of these believing that the reason that these were made was to save those mandrels ruined by those who insisted on tightening their knurled nuts with a pair of mole grips. One of the benefits of using those knurled nuts is that you knew how tight the nut was, it's not so easy to determine how tight the mandrel saver has been cranked towards the headstock. However I think that it's great, the speed with which you can change the blanks is fantastic and I am not going to miss having to change the length of the adjustable mandrel. The other benefit is that I won't waste a couple of minutes per hour searching for the nut in the shavings!
Still don't like it form the perspective of saving the mandrel though, you need to tighten either the nut or the mandrel to the correct tension regardless of which you use.
