Actually the Thundergut G that I had intonated poorly. The 12th fret harmonic was sharper than the fingered note. It had stretched near the bridge. I took them off anyway. Tried tuning them down a step and they felt and sounded more like the polys, But still sounded pretty bad. I know some people like the T guts, but i hope my review might stop a few of the people who would not like them from making a mistake and wasting their money.