Iceguy, in short the fins are great. My wife wanted to try the amphibian so she ordered a pair, a bit more work than she wanted out of a fin, probably due to the size of the fin. The sizing design they have is basically 2 sizes with inserts to size down, not a bad thing other than someone with a relatively small foot will be kicking around a fin the size of a XL SCP Jet fin with about a third of the weight. The fin is really pretty light. Due to their sizing design, the fin also fit me without the inserts, being that I kick around the SCP XL Jets the required effort of a blade designed fin was no problem to shift to. We took these fins on a 7 day liveaboard trip last week along with our regular fins to see how they did in the everyday open water style diving and for the most part, these fins excelled our expectations. When I first saw them I discounted them as being gimicky and paid little attention to the sales presentation, after diving them, I was rememebered an old saying my father used to say, you judge a book by its cover. During the liveaboard trip I spent alittle over 23 hours in this fin and only find 1 issue with them, during my safety stops on the hull of the boat (16 feet) when I would use the fin to push off the blade would flip up, outside of that they worked great. When a giant stride entry was made, the impact of the water on the bottom of the fin on the leading foot would cause the fin to fold up, once you made the initial kick the fin would snap back into place. During the exiting of the water, I simply placed the blade of the fin on the rung of the ladder above the desired step and stepped up, fin folded into place and I'd climb out of the water with the fin and equipment in place. In trying to determine the effort involved in folding them up before the ladder I just used the top of the foot to snap them up. During the week of diving a few of the crew members, and other divers dove them as well, general response was they liked them outside of the additional effort to kick them. They are not splits and do not kick like splits at all.
On Wenesday & Thursday I will be using them in a drysuit shell and will be able to see the effectiveness in that format, dont think I will ever use them in a cave or wreck environment though due to the folding up when when leverage is placed on the bottom of the fin. if you haven't tried them, and you have anopportunity to do so it will be well worth your wild, you may or may not like them but you should try them. I am putting this pair into our rental program for folks to try, they're not cheap so it may help if folks if they get to try them before they buy them. As a added bonus to walking with your fins on, they come with spring heels
Schott