If you spend a lot of time in the water it is good to explore other ways to get around. I used a variety of fins, dive scooters, tow planes and even wet subs over the years. This for specific function and at times for the sake of variety. I primarily used jet/rocket fins for a very long time for SCUBA and free diving alike. They were good for some applications, not so good for others, like extended breath hold diving. Finally tried long fins and switched to them for all diving even for most wreck penetrations. Function and to a lesser extent variety can drive things.
The Aqueon provides a different way of getting around and will provide some of that variety. I wouldn't want to use it for wreck penetrations. Still for open water swimming it can work quite well. It is good for cruising and covering a lot of bottom in particular. When I was a kid I wore fins with it. It is easy to step out fin along to do whatever and then come back to where it is floating on the surface and put it on again. It isn't for everyone but for some it is worth a look. With enough interest, perhaps Cal will put it back into production, an updated version with advanced materials (synthetic foils, composite kneel, and bearings, etc.) would be pretty intriguing.