Brutus, Too late for me to become enamored. I've been shooting a succession of Supers since the early '70s, and reloading the Super for almost as long. My first, a Combat Commander, and later a Series '70 Government model, had the old style barrels that attempted to headspace cartridges on the case mouth. They were both reliable, but absolutely dismal otherwise,i.e., terrible accuracy, flattened and pierced primers, bulged brass,etc. Most of my Supers were Colts, but now have a Kimber and STI in 38S. Both of these have been boringly reliable and trouble free by the way.
I really enjoy the caliber now that manufacturers use barrels headspacing on the case mouth. Hand loaders, and boutique ammunition manufacturers, can certainly produce ammunition that safely exceeds anything 9X19 can do. I think the Super most obviously pulls ahead of 9mm with the heavier bullet weights, 147 grains,etc. I've loaded safe 38S ammunition with 124/125 grain bullets that approximate the ballistics of the 9X23 Winchester cartridge. Didn't set out to achieve 9X23 ballistics, but got surprisingly close, with no issues whatsoever.
BTW, Most published 9mm data I've seen is from 4" barrels, while 38 Super data is usually quoted from 5" barrels. In chronographing both 9mm and 38S in 5" barrels, ballistics are more similar. It has also been my experience that 9mm 1911s, using the integrally ramped barrels employed by manufactures now days, are as functionally reliable as 1911s in 38S, 45 ACP, etc.......ymmv