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I was looking at an M17 evo and planned to add a swivel ($90-100 extra dollars) BUT the M19 evo is $60 more than the 17 at my shop. Your comment might have made up my mind … new to diving! Thxgreat choice, I used to dive S600 in cold water with no issues. s620 has the same performance. MK19 is an “MK17 with a swivel” and mk17 is a solid cold water reg. One of the most expensive combos you picked but its solid