I use the ScubaPro Jet Fins (split fins). I also have a pair of stiff fins, which I stopped using as soon as I discovered the split.
People that complain about flexibility and swimming against a current may be at a different level than "the rest of us". The split and the flexibility make them much more comfortable, and efficient at casual cruising speeds. If you intend on breaking some kind of speed or current-fighting record, then do factor that in. :)
Another factor: the color in the Jet Fins determine their buoyancy, I think the black ones sink, the others more or less float.
In California we use the spring straps mainly because the regular straps catch the strands in the kelp forests. They cost about $60, and are a definitely desirable upgrade as they adjust automatically to your foot (whichever size boot you have that day) and are a breeze to don and doff, yet they are relatively costly (about 60% of the fin cost spent on the strap).
| current weight: 88.0