I just received a 586LQ soprano in near-new condition from another SOTW member, and I must say, I am thoroughly impressed. It feels very nice in my hands (the original owner barely used it after purchasing it from Kessler Music in March, so it's already set-up), and the keywork is solid, actually far better than I expected on a horn a third the price of a Yani, and my expectations were fairly high to begin with, given the good things people have to say about the Antigua sopranos.
Since this is my first soprano, I obviously have a lot of work to do on my tone, but after about three hours, I find that I can get a very agreeable jazz sound with a metal Runyon Quantum & with the spoiler and a Vandoren ZZ #2. The reeds are brand-new, but already a little too soft, so I will probably move up to a #2.5 in the near future.
Out of curiosity, those of you who play an Antigua soprano, what is your jazz set-up?