Just had all my standing rigging replaced, and the rigger recommended swaged lowers, but he uses 5200 inside the terminal ends. The connections look really good now, with the collars completely compressed and a thin line of 5200 squeeze-out just visible. Seems to me it's a good choice for preventing water intrusion into the swaged connection.
My rigger also refused to replace my spleced wire to rope halyards, and made the same points about stretch as described above. He wanted what seemed to me to be a lot of money to replace them with rope, so I just went and bought some Spectra cored line and made them myself.