The Hosco SOS-EG1 works brilliantly on all Fender and Gibson electric guitars, where the nut is not compensated. Some other manufacturers, e.g. PRS, do an average compensation by moving the nut forward by about 0.6 mm, so this device will not work on those guitars. I have the the SOS-EG1 on all my Fender and Gibson guitars. The saddle compensations have to be changed a little to bring the 12th fret octaves back in tune, but this is easy to do. I file the nut slots down to be the same height as the first fret before I install the SOS, which ensures that all six strings press down firmly on it. If the nut slots are too high, there is a possibility that some or all of the strings will not be supported by the SOS. I use Music Nomad diamond nut slotting files in conjunction with a Hosco Step gauge to achieve the correct nut slot depth.