I'm in process of traning from Gara 3000 to C4 Mustang hard. Well, C4 are smaller (shorter and narrower) but faster. With same legs performance I saves 1-2 circles per 25m pool. C4 requires more underwater space, even in 1.8m pool I feels the bottom with fins. So, I don't feel comfortable with C4 in a pool and waiting for summer.
C4 producers are a bit slow in response for S&H. For me it took extra 1.5 month of waiting.
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