Seems to remarkably decrease latency (380ms -> 109ms). Running some tests:

    # ab -n 400 http://nlb-34dc3b430638dc3e.elb.us-west-2.amazonaws.com/
    Time per request: 108.779 [ms] (mean, across all concurrent requests)

    # ab -n 400 <public server via ELB>
    381.933

    # ab -n 400 <public server via ALB>
    380.632

    # (for reference) ab -n 400 https://www.google.com/
    190.536

    # (for reference) ab -n 400 https://sandbox-api.uber.com/health/
    107.680

If you're wiling to terminate SSL, this looks like it could be a solid improvement.