I tried the Warchal Brilliant cello strings after being disappointed with other brands I had tried on my current cello (Mirecourt c. 1890), which I have had for two years. The strings took 3-4 days to lose their edge, and about 7 days to stop stretching and settle in. The Brilliant strings are superb, comparable to the Larsen A and D that I used to favor on my previous cello (Germany, 1890), before they became so expensive. The cello I now have took over a year to really open up, but I was disappointed in the upper register. No longer. The Warchal Brilliant A and D are richer, with more projection, than I thought possible. The strings are even across all registers. They bring out the best in my instrument.
Chords are easy to play, in fact, the response is quick in general.
Beforehand, I had worried that they might have a rather "plastic" feel, but in fact, the feel under the hand is very similar to the metal core strings I have played my whole life. The only caveat I have is that with fine tuners, you have to turn twice as far to achieve the same change in pitch.