Hi Herb:
I have a pair of the Scubapro graphite TwinJets and like them. I bought the TwinJets to fit my drysuit boots and liked them enough to start using them with my drysuit boots (DUI Rock Boots) when diving wet. They have significantly reduced kick effort compared to paddle fins. I bought the graphite (gray) because the foot pocket is more supple than the black rubber version and fit my boots better.
Now having said that, they are different than traditional paddle fins, but not necessarily better. I believe that it is perhaps slightly harder to control your attitude in the water with split fins than with paddle fins as people say, but I've not had the trouble with different kick styles (eg frog kick, etc.) that some people report. I've used the split fins in strong current. With the reduced kick effort I did find that I got a lot less tired fighting a current than I would have with a paddle fin, but if you have a strong kick and don't tire easily a paddle fin will probably propel you better against a current.
Bottom line, if you have Scubapro Jetfins now, like them, and have a strong kick, I doubt you'll see any improvement with the split fins. (You'll see a difference, but I doubt it will be an improvement.) Try them out on some dives (or at least in the pool) to see if they're right for you before you plunk down your money.
HTH,
Bill