Well, since your report was locked and I didn't want to hijack pucho's thread I figured I would start my own. I think that the DiveR blades are way too long. They remind me of the Riffe fins but in fiberglass. In my opinion a blade ranging from 70-80 cm max is the ideal length depending on the size of the person using them. Man has copied nature in multiple ways to achieve his goal. We looked at a bird and we made a plane, this is just one of many examples. I don't know of any fish that has a huge fin to body ratio. I am completely aware of the muscle arrangement and physical differences but there has to be a balance.
I have used many fins starting from plastics to the carbons. There is no need to go into the differences that these different materials offer since this has been discussed in other threads. I have found that carbon blades outperform fiberglass and plastic fins. They are much lighter and much more reactive (Dan should be able to easily see this with his new test subject). It is true that some are more durable than others but that has to do with the resin/manufacture process they go through. My personal favorites are the carbontek 75 in medium (blade is 21cm wide by 75 cm long). I've had people step on them, I have jumped feet first from boats with them and they still there. I know that they are pricy but they are damn worth it. This doesn't mean go out and buy the most expensive ones you can find now but if you know someone that owns a pair he/she is nice enough to let you use them (on more than one dive) give them a try and you will know what you want for the upcoming Christmas.