I have had a set of LaBella DTFs (the Jamerson model) on a pbass for several months now, and I could not get the E string to sound right. Right out of the package, it suffered from the dreaded chorus effect, despite installing it correctly. Last week I took them off and installed a set of GHS Precision flats, and it's like a new world. They give me exactly the tone that I would expect from a P with flats, without the chorusing. Very happy so far...