The problem with ForceFins while swimming on the surface is the diver not the fin.
The beauty of the ForceFin partially comes from the reduced load on the recovery stroke that works with the weaker muscles in your leg to preform that motion when compared to the down/power stroke. This helps prevent cramping, minimizing fatigue and lactic acid production.
But this reduced load on the up/recovery stroke (when combined with the short blade), means that if you treat them like paddle fins that are really hard to drag upwards the ForceFin will "pop" out of the water and no fin is useful if its not in the water.
To successfully use Force Fins on the surface it takes some retraining your bad habits you learned from other fins. What I normally tell people is to either flip over to your back, which most people do with any fin, or to turn slightly to one side. The real trick is to not drive your leg on the recovery. Simply kick down, then consciously relax your leg vice pulling it back. What you will find is that even though you are trying to bring your leg up, is that it will be there, your muscle memory will bring it up.
Of my dives, I can honestly say that most (probably 90%) are shore dives. Some of the sites I would frequent had a 0.75- 1 mile surface swims, and the ForceFins are better hands down. Sure pretty much any fin is good enough for boat diving and most recreational diving in general since those dives are selected because of the mundane and gentle nature of the dive, dive operators don't like rescuing people and divers don't come back to operators that take them to really physically challenging dives. When you HAVE to go somewhere, ie surface swims/currents, a pair of ForceFins will make your day enjoyable and you probably won't even notice the challenge.