I have a Yamaha Attitude Deluxe tuned DGCF with Fender 9050M strings on it. (They are stainless flats, .055 .070 .090 .105 ). I'm a fan -- they are perfect for this bass with this tuning. They do a great job of producing that deep, angry stainless sound even though they are flats; I wouldn't really consider them to be mellow -- they sound a lot like Chromes but with more bottom end and overall balls. I have 5 string with Ernie Ball chrome flats on it. They are basically clones of D'Addario Chromes. In fact, they look and feel so much like Chromes that I would bet that they *are* Chromes, made in the same factory as the D'Addario Chromes, only with monochromatic ball ends and different gauge combinations than the D'Addario sets. They are good strings and I like them, but I probably wouldn't recommend them for DGCF unless you can get heavier gauge ones like the Fender 9050Ms.