This series is little known. I'd not heard of it until around the time MOS was released. A slew of Superman DVDs came out. One set was the Superboy TV series. It ran just prior to Lois an Clark and ceased production to make way for L&C. It ran 4 years and had very good ratings.
The last 2 seasons were especially good. Gerard Christopher, who starred, became a producer as well. A huge Superman fan he was responsible in part for some great eps. The Roads Not Taken episode, conceptually, IMO is one of the best Superman stories out there.
Roads Not Taken was years ahead in exploring the multi-verse. It features three Supermen. One good, one evil and one jaded who has given up being Superman. Now that would have made/make for a great Superman film trilogy.
For fans of the traditional Superman costume, the GC/Superboy costume took the Reeve costume and made it better. Cape, insignia and use of fabrics not available 15 years earlier.
If you get the chance check it out.
I only saw a handful of episodes back when it was on, I've always known of it. There was also a comic based on this TV series, which was good timing I suppose since the original Superboy in the comics had been erased by the Crisis anyway.
It's on my list to get to someday but my list is really long.