To sum it up. Too much of the same old thing.
While the original episode "The Moonglow Affair" with Mary Ann Mobley, as the young April Dancer & Norman Fell, as the too old to be a field agent Mark Slade was amusing is still fun to watch today, the series as a whole is uninspired.
Even the most famous episode (#3 "The Mother Muffin Affair") a crossover with Napoleon Solo & April Dancer against the great Boris Karloff in drag (as Mother Muffin)is beyond eyerolling laughable, even back in 1966.
Lets hope for histories sake, they left these on the shelf.