Not great, but mostly usable
I have been using this app since last year. It was pretty good for a while, but unfortunately for the last few months it’s been having issues. Every time I use my watch to track a cold shower it gives me an error when I end the session that reads “The data couldn’t be read because it is not in the correct format.” I made sure my phone and Apple Watch were both updated, so that doesn’t seem to be the issue. Despite this, it does still log the data from the session in the app, so it does still work, but it’s a bit buggy. An improvement I would suggest (aside from fixing the above issue) is that it would be really nice if starting a session from your Apple watch automatically put the water lock on. The app I use for surf tracking does this and it’s a really feature.