It works well when the unit sits at an angle of circa 20 degree to the body of the guitar. Even dive bombs return to the original tuning. However, I tried a set up (which I would prefer), where the base plate of the Tremelo unit is nearly horizontal. In this set up there are two return positions. One is very out of tune. It would appear that there are two edges of the "blade". This could be quite clearly seen on my tuner. I could repeatedly get it to return to one or the other.