Also tortured myself on an IBM Series 1 for a year.
In the meantime, I laid hands on the SEL 810 & 840, the XDS Sigma 7 and 9, CDC 7600, and the UNIVAC 1108.
I really liked that big iron, and a wide assortment of mini-computers as well. Those seemed almost God-like. Computers of today are remarkable, stunning really. Common as BIC pens, and not as fun seeming as the old stuff. What youngsters miss is the clatter of that stupid ASR33.