For me, these are the standard that everything else gets compared to. Even my new favourite Superbrights Marcus Miller got compared to XLs in their review.
For stainless steel roundwound strings, these are very flexible and easy on the fingers - don't chew on your fingertips like Rotosounds. Wide frequency range, deep bottom, chimy sparkly highs, midrange slightly shy, but not by much. I use(d) them for everything happily.
Some sets die off rather quickly and suddenly, but then they keep the thuddier remaining tone nice and articulate for a long time.