We've been enjoying our cold plunge immensely for the past 5 weeks. My wife and I both use it 3-5x per week and have already felt health benefits! After a long, hot 2+ hour mountain bike ride or an intense crossfit workout, jumping in our cold plunge helps our recovery times and even has helped with minor aches and pains. My wife also is sleeping better after using the plunge.
Our only complaint is the chiller is struggling to get (and keep) the temperature down to below 47 degrees. Now, it doesn't help that our plunge is outside in Las Vegas in the current 90-100+ degree heat. However, we have noticed even by shading the plunge so it gets no sun directly on it, it still struggles to go below 47-48 degrees. Even with the thermostat set to 46.
All in all, we are very happy with the cold plunge. Can't wait to try the hot plunge feature in the winter!