So far, these strings are the sound I hear in my head. It's modern but not particularly metallic. More organic and meaty, but not really "gut". They are full sounding, very even. I can really dig in and the strings don't choke. They definitely move some air, and I am really diggin' the E string. The Spiro E on my bass was a little, how should I say it, pale, compared to the rest of the set. The Dominant E output is a better match. I much prefer the Dom E. It will ggrrrowl if you want it to, but that's not where it goes first. The tension is very similar to the Spiros. My current string height is 6-7ish to 9-10ish (mm), and I like the bounce you get from the higher string height. I personally think that the old(er) school sound comes from string height and the way it forces you to play, as much as anything else. I'll report back after some amped gigs this next weekend. Very positive first impressions though.
-J