I've had a chance to try the Kelpie, mediums, and the C4-30's. The kelpies were somewhat stiff for surface swimming,and the floated up a little too much for my liking, although I was wearing a 6mm suit at the time. Still, they kept 'popping' above the water line as I surface swam out to an ice flow with one of our British guests.
The 30's, which I tried for the first time today, stayed in the water a bit better and they were easier on the legs than my 40's- makes me wonder what the 25's would be like?
I had really liked the Kelpies in the pool, but in a full winter wetsuit the 30's took the prize- for me at least. Actually, I ended up buying the 30's. Having done so I think I am ready to start downsizing my fin collection to just one pair of C4's, the 30s', and my Specialfin's Monofin- still the most comfortable monofin I have tried and much easier to go deep with. Plus, it looks like that's the way to go for the deep stuff nowadays.
I haven't had a chance to try the carbon-fiber fins from Special Fins, but Sven seems to think they are pretty special. I do know that I am no longer interested in the fiberplastic models.
One, surprising, thing that I noticed after all of this was how well my old SPorasub Radical's worked for spearfishing. I could beat the tar out of them and yet they still would allow me to kick all day long without even a hint of fatigue in my legs. For going deep the C4's do a better job than they did, but for surface swimming/ spearfishing they are still a nice fin- too bad they are no longer made.
Ted owns a pair of the Hard's and hasn't had a chance to try out my 30's yet. It will be interesting to hear what he thinks when he gets a chance.
There's also the Freedive-A-plooza thing coming up so that all of you can test out the Specialfins and the C4's. Mark, from OMER, might even make an apperance if things work out. This way each of you can try them out for yourself and decide if I am full of cr@p or not - which a could very well be.
jon