@paddy0091 I’ve used my Swim2 for a couple of years doing regular lane sets. It tracks lengths well, though you do have to make sure not to switch stroke mid length. My son has the Instinct and even when I swim behind him it can sometimes miscalculate a length, when the Swim2 gets it right, though this might be down to stroke style.
Open water works surprisingly well considering the GPS is underwater half the time. It also tracks runs, sleep, steps etc.
However, what I’m less pleased with is the feature set. For Garmin’s only dedicated swim watch, it lacks some basic data fields/screens that a pool swimmer would want to see.