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I dive with F-1s in my drysuit and find them comfortable, efficient and controllable. I really like them.
However, when I got a smaller pair do wetsuit diving, I found them to be too negatively buoyant and they impacted my trim.
I sent them back to Scuba Toys for a pair of Slipstreams, which I should receive shortly. I'll report back when I've had a chance to try them out.
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