I bought a few of those in the 70's when I was active in the Midwest Practical Pistol League, Columbia, MO. Practical pistol competition was truly practical in those days. We all had stock, or slightly modified, handguns: M15, M19, Python, Browning High Power, and misc. 1911s. Skill trumped technology in those days.
Hunt Speed Loaders: I still have them. Today there are better models for competition. I found my old Hunts to be very clumsy and slow in a recent Intermediate Defensive Pistol course I attended. Maybe the "rubber" is not as supple as it used to be.
For all around convenience of carry and reliability I prefer speed strips for field use. Speed strips keep my reloads organized and handy for woods loafing and hiking. They are more adapted to reloading a cylinder or two when a complete reload isn't required. I no longer compete and rarely "carry concealed" so speed strips work best for me.