Question about intermediate length fins

I recently purchased these fins. As you can see, they are intermediate length fins. Their main advantage was that they were available in a local store, so I could try them on to see that they fit. Now I am trying to decide whether I like them. They perform pretty much as you would expect -- I can do a faster tempo kick than I would with a long fin, but not quite as fast as with a short zoomer-type fin (I think). And I don't think you get quite the propulsion of a long fin, but more propulsion than a short fin. So, my question is whether these fins will be useful for either short-fin purposes (i.e., sprinting) or long-fin purposes (i.e., kick training) or both, or whether they are too much of a compromise and won't be good for either function. You can see which way I am leaning, but I am willing to be talked into the glorious advantages of intermediate length fins if I am missing something.