I have tried various strings so far, from multiple manufacturers like D'addario, Ernie Ball, Elixir etc but NYXL are by far the best and the most durable strings I played on.
Tone wise:
Clear and crisp highs, very balanced mids and very very controlled low end. Even after 4 months of playing on them in a studio environment, I don't notice too much of a difference of tone from the first week of using them.
Quality is really top. I usually have sweaty fingers / hands, and most of the strings so far tend to go black within a month ... NYXL, 4 months and not a single black mark on the strings. I have no idea what's on them, but it really keeps them looking fresh and working amazingly! I already switched to NYXL 11 and the overall tone is even better :)