I prefer the Deep 6 fins to my old Slipstreams too.
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I'm currently looking at replacing some Mares Avanti Quattro fins. I used those fins for all open water dives and was very happy with them. I'm going to be getting into some cavern diving and possibly cave diving down the line. So right no I'm looking at the Deep 6 Eddys and the Scubapro Seawing Novas. Unless someone recommends spending over double on the Seawings, I'm probably going to pull the trigger on the Eddys as I've heard great things about them. My question is, I know these types of fins are excellent for cavern/cave environments but should I also get a second pair along the lines of the Mares Avantis for open water/drift diving?