This was a weird set of strings. The three thicker (E, A and D) strings sound great. Fresh, crispy touch with nice sustain. The other three sounds old and dull, with no crisp (high frequency response) and short sustain. String G in particular, where the sound faded and died almost immediately after hitting it. Have been using D'Addario most of the time, and never experienced this before.
Don't have much to say about durability/quality, since I will replace these strings soon as I find a better alternative.