i would pick the 70 but your 584 is exceptional tom
If that's the blue one then yes, 70 hands down. The 1100 series is when they really changed the design and it was terribly easy to break and not be repairable. At first we loved how much cheaper these units were until we realized they were just trash after being trashed by housekeepers. I look at that 70, and all my memories of how to dissemble them and what parts were weak points (like that screw at the handle base) come flooding back from decades ago.I've always had a fondness for the model 70 and similar.