If Rick is correct, you are talking about either of two split fins.
I've owned Apollo Bio-Fins, Mares Volos and Mares Quattros, plus used or owned a few others .
The split fins really do work as advertised. For general diving they are great. While some have pooh-poohed them for various reasons, they perform exceptionally well. There are some things they do not do as well as paddles, but they still do them, e.g. turning, alternate kicks. The only thing I did not like was the folding over during pool sessions where you do a lot of standing with students. The other thing they just don't do is skulling backwards. I'm a photographer and this is important. Also, you can't do a little skulling to maintain an exact position as well. I did love them though for cruising the reef.
Cressi Frogs are very similar to Quattros and are excellent fins. Not too soft, not too stiff, not too heavy. If you are happy with what you've got and aren't weak legged, I'd stick with the Frogs. They look good, too.