I have been a rounds player for about 15 or 16 years. Always in original, louder rock bands of the indie leaning. Anyway, in the last year or so I've gotten the bug to try some flats. First, I bought some Chromes. Liked the sound but when it came time to audition for a new band, I got nervous and went out and bought my fav DR rounds again and put them on my 77P with dual p pups. I play with a pick, btw, and tune CEAD for this band. So, I've got a Squier Vintage Modified Telebass strung up CEAD. I did the series mod to it and it sounded great with the DR's and I thought I try the DR flats. Terrible. The lowest two strings had nothing but thud and no real sustain at all. Nothing like my Aria EB-3 copy with LaBella flats. Finally, today I did a major string swap. From the Squier to the Fender, DR flats, from the Fender goes the crappy Boomer rounds, onto the Squier go the old DR rounds. Ahhhh, better. The DR flats on the Fender really woke up and started to speak! Much better sustain(for a flat) and way better definition. My Fenderbird is wearing DR rounds now and I like them, but will eventually try whatever flats don't cut it on the P. All is right again in the world. Some strings just do work better on some basses. Now, if the DR flats that sound great on my P bass work with the band, I'll be set. If not, I'll be trying out some LaBella's, then back to Chromes for a little more sustain. I'm really looking forward to trying to get some tube breakup/saturation with these flats through my SVT/BergNV setup at practice. Later.