Yes sir. I put those on my J basses for awhile. While the 66's are bright and zing they always wore out on me very fast. I do really like Rotosounds though.
Time will tell with the Cobalts but as for how long they last but they have more fundamental note/tone than the 66's. It's hard to explain but the Cobalt's are just BIG sounding. Big, bright and harmonically powerful tone IMO. They extra harmonics really work well with the Spector and growl factor.
really nice. yeah i really like my 66's but id like to try something else because those are really hard on frets


