Looks like the Hollis F1 and Scubapro originals are more widely used. From what I gather, the Hollis F1's are lighter.
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Still have yet to pull the trigger on a pair of fins that I inquired about. Any further discussions? Scubapro is out because I don't have a dealer near me and it is against Scubapro policy to ship out a product to a customer. They want you in the store. I am not driving 4 hours round trip to make a fin purchase.