I have to agree with Abman, this thread is great! For the record I too have a pair of Rockets and a pair of splits but the splits see more use. I both instruct and guide divers for a living and switch fins back and forth to match what a student brings to class to help them with fin technique. For those who say you cant do advanced techinique with splits, you need to learn more. I can do every kick from a frog, helicopter, flutter and dolphin.
Furthermore, I often stride off the bow pulpit in my splits with a 20 lb anchor, 6 feet of chain and line to set the boat with absolutely no problem making fast headway under water with the weight and extra drag from pulling 50 feet of rope behind me. Once set I make a beeline to the back of the boat and grab the stern anchor dangling down and pull its weight and line to set it as well.
Even better, I can pull two 200lb men with all their gear who are Taiken diving for 30 mins. Wow, who knew that splits could actually generate thrust? When I take and advanced diver to 30 meters in current to look at garden eels its the splits I use because I know I can haul a$$ with them pulling someone if I need to.
If someone says that splits dont work in my opinion its a matter of technique and not design engineering. There is no doubt that rockets or jets are siginifantly more manueverable in rotation technique but thats about it. I make my living my towing either a large camera rig, anchors/chains/lines, or people under water and do so with splits almost every day of the week. Of the 146 dives I have made this year maybe 6 or so have been with the rockets.
My 2 cents.!