Something interesting to know about, there are a lot of factors why a product last longer than others. This is the story, about a week ago, I visited a museum type of dive shop.
They were having whole bunch of Jets or Jets liked fins. The Cressi Rondine, older than the review given here, what does it looks like? Jets (I was trying to upload the pic but failed, anyway), then the original Jets made by Beuchat (Yes, it's called Jets, printed on the fins, the ancestor of SP Jets), Jets by ScubaPro "the old rubber version", then a relatively new Contact Pro made by Beuchat (not the same Contact you can see now), they all looked the same, some are a bit longer, full foot, open heal....etc.
Except for the SP Jets, all the others are not in production anymore (well, sorry, turtle), meaning maybe the name is still there, e.g. Rondine, but it's not the Jets like Rondine; Contact, quite different now. So, SP Jets is popular, no question about it; good design, no question about it too. It actually made the whole market making similar products. Is it really the other similar products are not as good... maybe, I don't know. Marketing, maybe. The market need something new to drive, that too. Let me take a guess on what is going to happen to the split fins, maybe 2 to 3 would stay around for a longer, then after a long while 1 to 2 left, maybe.