I can't say for sure exactly how they compare to day 1 but I've had mine on for well over a year and loving them just the same. Before that I used fender flats for a few years. I liked them a lot too but I don't miss them at all. And to address the top end, I've found that I actually roll off w/tone knob more so with these than any other flats I've used. Very responsive is the term I'd use. heres a link to a recording (in context with the band) where I used cobalt flats on tracks 1 thru 10 Jazz bass/ Lindy Fralin p/u. Track 4 probably best provides most contrast between registers. track 7 shows how E string responds to drop tuning. Track 8 nice fundamental sound for a bluesy/walking line not lacking on low end harmonics, sits nicely in the mix. These are all with tone rolled off a bit. Taste is very subjective, yes, but I love these strings for what I do.