At the beginning of my career there were cheap devices that had reached old age. My SH-1 and MS-20 were already things that you should and would twist, thwart and defy, trying hard not to be part of the 1970’s. No one ever ever used words like legendary. We would make our legends thank you very much.
In the 1980s there were new things, which I (to best of my limited budget) would take up. Some for better, some for worse (like the detestable TB303). The SH-101 was not particularly advanced compared to my SH-1. It used batteries, was very light and could be hung around your shoulder (no I did not) and came with a built in sequencer (much easier than the separate CSQ-100). Not a major jump in sound, and I tended to use it as bass guitar and a snare, whereas the SH-1 had made near every sound not from a Casiotone.
I would probably buy a SH-1 again if the deal was fair, but the SH-101 I don’t really care about. It did the rhythm section alongside the MC-202, and when I no longer did that thing I was fine to let it go. But please be sure to read other people who based their whole sound around it.
You can get all kinds of re-creations today, from Roland’s ZenCore to Behringer’s MS-1 to the Donner L-1 … and I really don’t care that much.